10-K Filing

MDU RESOURCES GROUP INC CIK: 67716 FY 2024

Filing Information

Form Type	10-K
Accession Number	`0000067716-25-000016`
Period End Date	20241231
Filing Date	20250220
Fiscal Year	2024
Fiscal Period	FY
XBRL Instance	mdu-20241231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 174 Income Statement 144 Cash Flow Statement 310 Stockholders Equity 68 Comprehensive Income 66

Balance Sheet 174 line items

Line Item	Tag	Value	Unit	Period
Cash, cash equivalents and restricted cash	`CashAndCashEquivalentsAtCarryingValue`	$66.90M	USD	Point-in-time
Cash, cash equivalents and restricted cash	`CashAndCashEquivalentsAtCarryingValue`	$66.90M	USD	Point-in-time
Cash, cash equivalents and restricted cash	`CashAndCashEquivalentsAtCarryingValue`	$60.47M	USD	Point-in-time
Cash, cash equivalents and restricted cash	`CashAndCashEquivalentsAtCarryingValue`	$60.47M	USD	Point-in-time
Receivables, net	`ReceivablesNetCurrent`	$274.30M	USD	Point-in-time
Receivables, net	`ReceivablesNetCurrent`	$274.30M	USD	Point-in-time
Receivables, net	`ReceivablesNetCurrent`	$250.15M	USD	Point-in-time
Receivables, net	`ReceivablesNetCurrent`	$250.15M	USD	Point-in-time
Current regulatory assets	`RegulatoryAssetsCurrent`	$215.44M	USD	Point-in-time
Current regulatory assets	`RegulatoryAssetsCurrent`	$215.44M	USD	Point-in-time
Current regulatory assets	`RegulatoryAssetsCurrent`	$172.49M	USD	Point-in-time
Current regulatory assets	`RegulatoryAssetsCurrent`	$172.49M	USD	Point-in-time
Inventories	`InventoryNet`	$44.94M	USD	Point-in-time
Inventories	`InventoryNet`	$44.94M	USD	Point-in-time
Inventories	`InventoryNet`	$44.68M	USD	Point-in-time
Inventories	`InventoryNet`	$44.68M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$66.43M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$66.43M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$64.68M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$64.68M	USD	Point-in-time
Current assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets`	$769.49M	USD	Point-in-time
Current assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets`	$769.49M	USD	Point-in-time
Current assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets`	-	USD	Point-in-time
Current assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets`	-	USD	Point-in-time
Total current assets	`AssetsCurrent`	$1.36B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$1.36B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$666.26M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$666.26M	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$7.08B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$7.55B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$7.55B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$7.08B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$6.63B	USD	Point-in-time
Property, plant and equipment	`PropertyPlantAndEquipmentGross`	$6.63B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$2.08B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$1.96B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$2.08B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$2.21B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$2.21B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$1.96B	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$5.00B	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$5.00B	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$5.34B	USD	Point-in-time
Net property, plant and equipment	`PropertyPlantAndEquipmentNet`	$5.34B	USD	Point-in-time
Goodwill	`Goodwill`	$345.74M	USD	Point-in-time
Goodwill	`Goodwill`	$345.74M	USD	Point-in-time
Goodwill	`Goodwill`	$345.74M	USD	Point-in-time
Goodwill	`Goodwill`	$345.74M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$322.35M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$322.35M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$447.10M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$447.10M	USD	Point-in-time
Investments	`LongTermInvestments`	$112.47M	USD	Point-in-time
Investments	`LongTermInvestments`	$112.47M	USD	Point-in-time
Investments	`LongTermInvestments`	$115.46M	USD	Point-in-time
Investments	`LongTermInvestments`	$115.46M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$244.72M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$244.72M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$211.37M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$211.37M	USD	Point-in-time
Noncurrent assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent`	-	USD	Point-in-time
Noncurrent assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent`	-	USD	Point-in-time
Noncurrent assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent`	$347.87M	USD	Point-in-time
Noncurrent assets of discontinued operations	`DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent`	$347.87M	USD	Point-in-time
Total noncurrent assets	`AssetsNoncurrent`	$6.47B	USD	Point-in-time
Total noncurrent assets	`AssetsNoncurrent`	$6.47B	USD	Point-in-time
Total noncurrent assets	`AssetsNoncurrent`	$6.37B	USD	Point-in-time
Total noncurrent assets	`AssetsNoncurrent`	$6.37B	USD	Point-in-time
Total assets	`Assets`	$7.04B	USD	Point-in-time
Total assets	`Assets`	$7.04B	USD	Point-in-time
Total assets	`Assets`	$9.66B	USD	Point-in-time
Total assets	`Assets`	$9.66B	USD	Point-in-time
Total assets	`Assets`	$7.83B	USD	Point-in-time
Total assets	`Assets`	$7.83B	USD	Point-in-time
Short-term borrowings	`ShortTermBorrowings`	$95.00M	USD	Point-in-time
Short-term borrowings	`ShortTermBorrowings`	$95.00M	USD	Point-in-time
Short-term borrowings	`ShortTermBorrowings`	-	USD	Point-in-time
Short-term borrowings	`ShortTermBorrowings`	-	USD	Point-in-time
Long-term debt due within one year	`LongTermDebtCurrent`	$61.32M	USD	Point-in-time
Long-term debt due within one year	`LongTermDebtCurrent`	$61.32M	USD	Point-in-time
Long-term debt due within one year	`LongTermDebtCurrent`	$161.70M	USD	Point-in-time
Long-term debt due within one year	`LongTermDebtCurrent`	$161.70M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$150.07M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$159.97M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$159.97M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$150.07M	USD	Point-in-time
Regulatory liabilities due within one year	`RegulatoryLiabilityCurrent`	$137.17M	USD	Point-in-time
Regulatory liabilities due within one year	`RegulatoryLiabilityCurrent`	$137.17M	USD	Point-in-time
Regulatory liabilities due within one year	`RegulatoryLiabilityCurrent`	$70.76M	USD	Point-in-time
Regulatory liabilities due within one year	`RegulatoryLiabilityCurrent`	$70.76M	USD	Point-in-time
Taxes payable	`TaxesPayableCurrent`	$43.37M	USD	Point-in-time
Taxes payable	`TaxesPayableCurrent`	$43.37M	USD	Point-in-time
Taxes payable	`TaxesPayableCurrent`	$49.55M	USD	Point-in-time
Taxes payable	`TaxesPayableCurrent`	$49.55M	USD	Point-in-time
Dividends payable	`DividendsPayableCurrent`	$26.51M	USD	Point-in-time
Dividends payable	`DividendsPayableCurrent`	$26.51M	USD	Point-in-time
Dividends payable	`DividendsPayableCurrent`	$25.46M	USD	Point-in-time
Dividends payable	`DividendsPayableCurrent`	$25.46M	USD	Point-in-time
Accrued compensation	`EmployeeRelatedLiabilitiesCurrent`	$35.26M	USD	Point-in-time
Accrued compensation	`EmployeeRelatedLiabilitiesCurrent`	$35.26M	USD	Point-in-time
Accrued compensation	`EmployeeRelatedLiabilitiesCurrent`	$40.79M	USD	Point-in-time
Accrued compensation	`EmployeeRelatedLiabilitiesCurrent`	$40.79M	USD	Point-in-time
Other accrued liabilities	`OtherLiabilitiesCurrent`	$124.51M	USD	Point-in-time
Other accrued liabilities	`OtherLiabilitiesCurrent`	$124.51M	USD	Point-in-time
Other accrued liabilities	`OtherLiabilitiesCurrent`	$129.59M	USD	Point-in-time
Other accrued liabilities	`OtherLiabilitiesCurrent`	$129.59M	USD	Point-in-time
Current liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent`	-	USD	Point-in-time
Current liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent`	-	USD	Point-in-time
Current liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent`	$443.28M	USD	Point-in-time
Current liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent`	$443.28M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$678.60M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$678.60M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.08B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.08B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$2.13B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$2.13B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$2.10B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$2.10B	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$441.32M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$441.32M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$452.34M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$452.34M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$521.05M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$521.05M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$459.17M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$459.17M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$406.35M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$406.35M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$384.37M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$384.37M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$231.90M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$231.90M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$209.88M	USD	Point-in-time
Other	`OtherLiabilitiesNoncurrent`	$209.88M	USD	Point-in-time
Noncurrent liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent`	$179.65M	USD	Point-in-time
Noncurrent liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent`	$179.65M	USD	Point-in-time
Noncurrent liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent`	-	USD	Point-in-time
Noncurrent liabilities of discontinued operations	`LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent`	-	USD	Point-in-time
Total noncurrent liabilities	`LiabilitiesNoncurrent`	$3.67B	USD	Point-in-time
Total noncurrent liabilities	`LiabilitiesNoncurrent`	$3.67B	USD	Point-in-time
Total noncurrent liabilities	`LiabilitiesNoncurrent`	$3.85B	USD	Point-in-time
Total noncurrent liabilities	`LiabilitiesNoncurrent`	$3.85B	USD	Point-in-time
Commitments and contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 203,934,578 at December 31, 2024 and 203,689,090 at December 31, 2023	`CommonStockValueOutstanding`	$203.69M	USD	Point-in-time
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 203,934,578 at December 31, 2024 and 203,689,090 at December 31, 2023	`CommonStockValueOutstanding`	$203.69M	USD	Point-in-time
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 203,934,578 at December 31, 2024 and 203,689,090 at December 31, 2023	`CommonStockValueOutstanding`	$203.94M	USD	Point-in-time
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 203,934,578 at December 31, 2024 and 203,689,090 at December 31, 2023	`CommonStockValueOutstanding`	$203.94M	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.47B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.47B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.47B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$1.47B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.25B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.25B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.03B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.03B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-16.80M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-16.80M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-18.38M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-18.38M	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$3.59B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$2.69B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$3.59B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$2.69B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$2.91B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$3.38B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$3.38B	USD	Point-in-time
Total stockholders' equity	`StockholdersEquity`	$2.91B	USD	Point-in-time
Total liabilities and stockholders' equity	`LiabilitiesAndStockholdersEquity`	$7.83B	USD	Point-in-time
Total liabilities and stockholders' equity	`LiabilitiesAndStockholdersEquity`	$7.04B	USD	Point-in-time
Total liabilities and stockholders' equity	`LiabilitiesAndStockholdersEquity`	$7.83B	USD	Point-in-time
Total liabilities and stockholders' equity	`LiabilitiesAndStockholdersEquity`	$7.04B	USD	Point-in-time

Income Statement 144 line items

Line Item	Tag	Value	Unit	Period
External operating revenues	`Revenues`	$1.76B	USD	Annual
External operating revenues	`Revenues`	$1.76B	USD	Annual
External operating revenues	`Revenues`	$1.75B	USD	Annual
External operating revenues	`Revenues`	$1.75B	USD	Annual
External operating revenues	`Revenues`	$1.80B	USD	Annual
External operating revenues	`Revenues`	$1.80B	USD	Annual
Purchased natural gas sold	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$742.97M	USD	Annual
Purchased natural gas sold	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$742.97M	USD	Annual
Purchased natural gas sold	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$757.88M	USD	Annual
Purchased natural gas sold	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$757.88M	USD	Annual
Purchased natural gas sold	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$630.40M	USD	Annual
Purchased natural gas sold	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$630.40M	USD	Annual
Electric fuel and purchased power	`UtilitiesOperatingExpensePurchasedPower`	$119.41M	USD	Annual
Electric fuel and purchased power	`UtilitiesOperatingExpensePurchasedPower`	$119.41M	USD	Annual
Electric fuel and purchased power	`UtilitiesOperatingExpensePurchasedPower`	$134.78M	USD	Annual
Electric fuel and purchased power	`UtilitiesOperatingExpensePurchasedPower`	$141.15M	USD	Annual
Electric fuel and purchased power	`UtilitiesOperatingExpensePurchasedPower`	$141.15M	USD	Annual
Electric fuel and purchased power	`UtilitiesOperatingExpensePurchasedPower`	$134.78M	USD	Annual
Operation and maintenance	`SellingGeneralAndAdministrativeExpense`	$379.95M	USD	Annual
Operation and maintenance	`SellingGeneralAndAdministrativeExpense`	$414.49M	USD	Annual
Operation and maintenance	`SellingGeneralAndAdministrativeExpense`	$414.49M	USD	Annual
Operation and maintenance	`SellingGeneralAndAdministrativeExpense`	$407.08M	USD	Annual
Operation and maintenance	`SellingGeneralAndAdministrativeExpense`	$407.08M	USD	Annual
Operation and maintenance	`SellingGeneralAndAdministrativeExpense`	$379.95M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$188.56M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$188.56M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$190.45M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$190.45M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$200.08M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$200.08M	USD	Annual
Taxes, other than income	`TaxesExcludingIncomeAndExciseTaxes`	$103.13M	USD	Annual
Taxes, other than income	`TaxesExcludingIncomeAndExciseTaxes`	$103.13M	USD	Annual
Taxes, other than income	`TaxesExcludingIncomeAndExciseTaxes`	$106.22M	USD	Annual
Taxes, other than income	`TaxesExcludingIncomeAndExciseTaxes`	$106.22M	USD	Annual
Taxes, other than income	`TaxesExcludingIncomeAndExciseTaxes`	$100.63M	USD	Annual
Taxes, other than income	`TaxesExcludingIncomeAndExciseTaxes`	$100.63M	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.55B	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.49B	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.55B	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.58B	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.58B	USD	Annual
Total operating expenses	`OperatingExpenses`	$1.49B	USD	Annual
Operating income	`OperatingIncomeLoss`	$224.94M	USD	Annual
Operating income	`OperatingIncomeLoss`	$224.94M	USD	Annual
Operating income	`OperatingIncomeLoss`	$265.64M	USD	Annual
Operating income	`OperatingIncomeLoss`	$265.64M	USD	Annual
Operating income	`OperatingIncomeLoss`	$200.87M	USD	Annual
Operating income	`OperatingIncomeLoss`	$200.87M	USD	Annual
Realized gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Realized gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Realized gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Realized gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	$186.56M	USD	Annual
Realized gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	$186.56M	USD	Annual
Realized gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$3.26M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$3.26M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$33.45M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$33.45M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$41.37M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$41.37M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$104.62M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$108.35M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$108.35M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$80.68M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$80.68M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$104.62M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$198.66M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$123.45M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$198.66M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$340.33M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$123.45M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$340.33M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$6.20M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$6.20M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$10.21M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$10.21M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$17.59M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$17.59M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$330.12M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$330.12M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$181.07M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$181.07M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$117.25M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$117.25M	USD	Annual
Discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$250.24M	USD	Annual
Discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$84.59M	USD	Annual
Discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$250.24M	USD	Annual
Discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$84.59M	USD	Annual
Discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$100.03M	USD	Annual
Discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$100.03M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.89	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.89	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.58	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.58	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.62	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.62	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$0.42	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$1.23	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$0.42	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$0.49	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$0.49	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$1.23	USD	Annual
Earnings per share - basic (in usd per share)	`EarningsPerShareBasic`	$1.38	USD	Annual
Earnings per share - basic (in usd per share)	`EarningsPerShareBasic`	$1.81	USD	Annual
Earnings per share - basic (in usd per share)	`EarningsPerShareBasic`	$1.38	USD	Annual
Earnings per share - basic (in usd per share)	`EarningsPerShareBasic`	$2.04	USD	Annual
Earnings per share - basic (in usd per share)	`EarningsPerShareBasic`	$2.04	USD	Annual
Earnings per share - basic (in usd per share)	`EarningsPerShareBasic`	$1.81	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.58	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.58	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.88	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.88	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.62	USD	Annual
Income from continuing operations (in usd per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.62	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$0.41	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$1.23	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$0.41	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$0.49	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$0.49	USD	Annual
Discontinued operations, net of tax (in usd per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$1.23	USD	Annual
Earnings per share - diluted (in usd per share)	`EarningsPerShareDiluted`	$2.03	USD	Annual
Earnings per share - diluted (in usd per share)	`EarningsPerShareDiluted`	$2.03	USD	Annual
Earnings per share - diluted (in usd per share)	`EarningsPerShareDiluted`	$1.37	USD	Annual
Earnings per share - diluted (in usd per share)	`EarningsPerShareDiluted`	$1.37	USD	Annual
Earnings per share - diluted (in usd per share)	`EarningsPerShareDiluted`	$1.81	USD	Annual
Earnings per share - diluted (in usd per share)	`EarningsPerShareDiluted`	$1.81	USD	Annual
Weighted average common shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.64M	shares	Annual
Weighted average common shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.64M	shares	Annual
Weighted average common shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.87M	shares	Annual
Weighted average common shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.36M	shares	Annual
Weighted average common shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.36M	shares	Annual
Weighted average common shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.87M	shares	Annual
Weighted average common shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	204.65M	shares	Annual
Weighted average common shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	203.46M	shares	Annual
Weighted average common shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	203.46M	shares	Annual
Weighted average common shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	203.94M	shares	Annual
Weighted average common shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	203.94M	shares	Annual
Weighted average common shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	204.65M	shares	Annual

Cash Flow Statement 310 line items

Line Item	Tag	Value	Unit	Period
Reclassification adjustment for loss on derivative instruments included in net income, tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$-177.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$-177.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	-	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	-	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$-15.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, tax	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	$-15.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$201.00K	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-360.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-360.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$201.00K	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-3.96M	USD	Annual
Postretirement liability gains (losses) arising during the period, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax`	$-3.96M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Income from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$250.24M	USD	Annual
Income from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$250.24M	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$145.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$145.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$78.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$78.00K	USD	Annual
Income from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$84.59M	USD	Annual
Income from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$100.03M	USD	Annual
Income from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$100.03M	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$597.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$597.00K	USD	Annual
Income from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$84.59M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetTax`	-	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$117.25M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$117.25M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetTax`	-	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$181.07M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$181.07M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetTax`	$1.09M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetTax`	$1.09M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$330.12M	USD	Annual
Income from continuing operations	`IncomeLossFromContinuingOperations`	$330.12M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetTax`	-	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetTax`	-	USD	Annual
Net unrealized loss on available-for-sale investments arising during the period, tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$23.00K	USD	Annual
Net unrealized loss on available-for-sale investments arising during the period, tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$23.00K	USD	Annual
Net unrealized loss on available-for-sale investments arising during the period, tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$46.00K	USD	Annual
Net unrealized loss on available-for-sale investments arising during the period, tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$46.00K	USD	Annual
Net unrealized loss on available-for-sale investments arising during the period, tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$-177.00K	USD	Annual
Net unrealized loss on available-for-sale investments arising during the period, tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$-177.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax`	$-31.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax`	$-31.00K	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$200.08M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$200.08M	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax`	$-5.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax`	$-5.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax`	$-11.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax`	$-11.00K	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$190.45M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$190.45M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$188.56M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$188.56M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$20.19M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$20.19M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-1.31M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-16.08M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-16.08M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$-1.31M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$5.41M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$6.56M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$6.56M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$7.42M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$7.42M	USD	Annual
Provision for credit losses	`ProvisionForDoubtfulAccounts`	$5.41M	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$1.01M	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$1.01M	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$1.83M	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$1.83M	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$885.00K	USD	Annual
Amortization of debt issuance costs	`AmortizationOfFinancingCosts`	$885.00K	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$5.50M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$7.91M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$5.50M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$8.42M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$8.42M	USD	Annual
Employee stock-based compensation costs	`ShareBasedCompensation`	$7.91M	USD	Annual
Pension and postretirement benefit plan net periodic benefit credit	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$-5.38M	USD	Annual
Pension and postretirement benefit plan net periodic benefit credit	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$-5.38M	USD	Annual
Pension and postretirement benefit plan net periodic benefit credit	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$-7.32M	USD	Annual
Pension and postretirement benefit plan net periodic benefit credit	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$-7.32M	USD	Annual
Pension and postretirement benefit plan net periodic benefit credit	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$-3.84M	USD	Annual
Pension and postretirement benefit plan net periodic benefit credit	`PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash`	$-3.84M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$5.94M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$5.94M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$7.43M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$-10.12M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$-10.12M	USD	Annual
Unrealized (gains) losses on investments	`UnrealizedGainLossOnInvestments`	$7.43M	USD	Annual
(Gains) losses on sales of assets	`GainLossOnDispositionOfAssets1`	$347.00K	USD	Annual
(Gains) losses on sales of assets	`GainLossOnDispositionOfAssets1`	$347.00K	USD	Annual
(Gains) losses on sales of assets	`GainLossOnDispositionOfAssets1`	$-15.00K	USD	Annual
(Gains) losses on sales of assets	`GainLossOnDispositionOfAssets1`	$-15.00K	USD	Annual
(Gains) losses on sales of assets	`GainLossOnDispositionOfAssets1`	$857.00K	USD	Annual
(Gains) losses on sales of assets	`GainLossOnDispositionOfAssets1`	$857.00K	USD	Annual
Gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	$186.56M	USD	Annual
Gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	$186.56M	USD	Annual
Gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Gain on tax-free exchange of the retained shares in Knife River	`DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount`	-	USD	Annual
Receivables	`IncreaseDecreaseInReceivables`	$-79.11M	USD	Annual
Receivables	`IncreaseDecreaseInReceivables`	$30.31M	USD	Annual
Receivables	`IncreaseDecreaseInReceivables`	$-79.11M	USD	Annual
Receivables	`IncreaseDecreaseInReceivables`	$91.19M	USD	Annual
Receivables	`IncreaseDecreaseInReceivables`	$30.31M	USD	Annual
Receivables	`IncreaseDecreaseInReceivables`	$91.19M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$21.73M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-243.00K	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$21.73M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-246.00K	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-246.00K	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-243.00K	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$-14.52M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$-14.52M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$48.49M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$48.49M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$-80.98M	USD	Annual
Other current assets	`IncreaseDecreaseInOtherCurrentAssets`	$-80.98M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$-443.00K	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$-87.21M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$-443.00K	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$84.55M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$84.55M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$-87.21M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$-5.25M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$-5.25M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$-26.87M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$-26.87M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$73.36M	USD	Annual
Other current liabilities	`IncreaseDecreaseInOtherCurrentLiabilities`	$73.36M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$7.64M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$7.64M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$81.00K	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$3.00M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$3.00M	USD	Annual
Pension and postretirement benefit plan contributions	`PensionAndOtherPostretirementBenefitContributions`	$81.00K	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$1.65M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$2.57M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$2.57M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$15.55M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$15.55M	USD	Annual
Other noncurrent changes	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$1.65M	USD	Annual
Net cash provided by continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$411.81M	USD	Annual
Net cash provided by continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$305.33M	USD	Annual
Net cash provided by continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$411.81M	USD	Annual
Net cash provided by continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$321.62M	USD	Annual
Net cash provided by continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$321.62M	USD	Annual
Net cash provided by continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$305.33M	USD	Annual
Net cash provided by discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$188.45M	USD	Annual
Net cash provided by discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$188.45M	USD	Annual
Net cash provided by discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$90.50M	USD	Annual
Net cash provided by discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$90.50M	USD	Annual
Net cash provided by discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$27.29M	USD	Annual
Net cash provided by discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$27.29M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$502.32M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$502.32M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$332.63M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$332.63M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$510.06M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$510.06M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$484.14M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$484.14M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$442.58M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$522.82M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$522.82M	USD	Annual
Capital expenditures	`PaymentsToAcquireProductiveAssets`	$442.58M	USD	Annual
Net proceeds from sale or disposition of property	`ProceedsFromSaleOfProductiveAssets`	$260.00K	USD	Annual
Net proceeds from sale or disposition of property	`ProceedsFromSaleOfProductiveAssets`	$691.00K	USD	Annual
Net proceeds from sale or disposition of property	`ProceedsFromSaleOfProductiveAssets`	$691.00K	USD	Annual
Net proceeds from sale or disposition of property	`ProceedsFromSaleOfProductiveAssets`	$3.00K	USD	Annual
Net proceeds from sale or disposition of property	`ProceedsFromSaleOfProductiveAssets`	$3.00K	USD	Annual
Net proceeds from sale or disposition of property	`ProceedsFromSaleOfProductiveAssets`	$260.00K	USD	Annual
Cost of removal, net of salvage value	`PaymentsForProceedsFromRemovalCosts`	$11.78M	USD	Annual
Cost of removal, net of salvage value	`PaymentsForProceedsFromRemovalCosts`	$11.78M	USD	Annual
Cost of removal, net of salvage value	`PaymentsForProceedsFromRemovalCosts`	$-1.17M	USD	Annual
Cost of removal, net of salvage value	`PaymentsForProceedsFromRemovalCosts`	$-1.17M	USD	Annual
Cost of removal, net of salvage value	`PaymentsForProceedsFromRemovalCosts`	$5.54M	USD	Annual
Cost of removal, net of salvage value	`PaymentsForProceedsFromRemovalCosts`	$5.54M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$5.16M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$2.42M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$5.16M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$2.57M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$2.57M	USD	Annual
Investments	`PaymentsForProceedsFromInvestments`	$2.42M	USD	Annual
Proceeds from investment cost basis withdrawal	`ProceedsFromInvestmentsCostBasisWithdrawal`	$9.00M	USD	Annual
Proceeds from investment cost basis withdrawal	`ProceedsFromInvestmentsCostBasisWithdrawal`	$9.00M	USD	Annual
Proceeds from investment cost basis withdrawal	`ProceedsFromInvestmentsCostBasisWithdrawal`	$20.00M	USD	Annual
Proceeds from investment cost basis withdrawal	`ProceedsFromInvestmentsCostBasisWithdrawal`	-	USD	Annual
Proceeds from investment cost basis withdrawal	`ProceedsFromInvestmentsCostBasisWithdrawal`	-	USD	Annual
Proceeds from investment cost basis withdrawal	`ProceedsFromInvestmentsCostBasisWithdrawal`	$20.00M	USD	Annual
Net cash used in continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-465.13M	USD	Annual
Net cash used in continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-465.13M	USD	Annual
Net cash used in continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-523.83M	USD	Annual
Net cash used in continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-523.83M	USD	Annual
Net cash used in continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-456.93M	USD	Annual
Net cash used in continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-456.93M	USD	Annual
Net cash used in discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-75.66M	USD	Annual
Net cash used in discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-181.95M	USD	Annual
Net cash used in discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-75.66M	USD	Annual
Net cash used in discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-28.86M	USD	Annual
Net cash used in discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-28.86M	USD	Annual
Net cash used in discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-181.95M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-552.68M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-552.68M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-638.88M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-638.88M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-540.79M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-540.79M	USD	Annual
Issuance of short-term borrowings	`ProceedsFromShortTermDebt`	-	USD	Annual
Issuance of short-term borrowings	`ProceedsFromShortTermDebt`	-	USD	Annual
Issuance of short-term borrowings	`ProceedsFromShortTermDebt`	$11.50M	USD	Annual
Issuance of short-term borrowings	`ProceedsFromShortTermDebt`	$810.00M	USD	Annual
Issuance of short-term borrowings	`ProceedsFromShortTermDebt`	$810.00M	USD	Annual
Issuance of short-term borrowings	`ProceedsFromShortTermDebt`	$11.50M	USD	Annual
Repayment of short-term borrowings	`RepaymentsOfShortTermDebt`	$433.90M	USD	Annual
Repayment of short-term borrowings	`RepaymentsOfShortTermDebt`	$433.90M	USD	Annual
Repayment of short-term borrowings	`RepaymentsOfShortTermDebt`	$95.00M	USD	Annual
Repayment of short-term borrowings	`RepaymentsOfShortTermDebt`	$95.00M	USD	Annual
Repayment of short-term borrowings	`RepaymentsOfShortTermDebt`	-	USD	Annual
Repayment of short-term borrowings	`RepaymentsOfShortTermDebt`	-	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$594.70M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$594.70M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$308.60M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$214.97M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$214.97M	USD	Annual
Issuance of long-term debt	`ProceedsFromIssuanceOfLongTermDebt`	$308.60M	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$38.76M	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$568.88M	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$38.76M	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$182.13M	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$182.13M	USD	Annual
Repayment of long-term debt	`RepaymentsOfLongTermDebt`	$568.88M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$1.13M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$1.13M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$2.52M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$2.52M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$2.46M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$2.46M	USD	Annual
Costs of issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Costs of issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$-150.00K	USD	Annual
Costs of issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Costs of issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$-50.00K	USD	Annual
Costs of issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$-50.00K	USD	Annual
Costs of issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$-150.00K	USD	Annual
Dividends paid	`PaymentsOfDividends`	$176.91M	USD	Annual
Dividends paid	`PaymentsOfDividends`	$176.91M	USD	Annual
Dividends paid	`PaymentsOfDividends`	$161.32M	USD	Annual
Dividends paid	`PaymentsOfDividends`	$161.32M	USD	Annual
Dividends paid	`PaymentsOfDividends`	$102.94M	USD	Annual
Dividends paid	`PaymentsOfDividends`	$102.94M	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	$4.81M	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	$4.81M	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	-	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	$7.40M	USD	Annual
Repurchase of common stock	`PaymentsForRepurchaseOfCommonStock`	$7.40M	USD	Annual
Tax withholding on stock-based compensation	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$4.90M	USD	Annual
Tax withholding on stock-based compensation	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$4.90M	USD	Annual
Tax withholding on stock-based compensation	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$3.04M	USD	Annual
Tax withholding on stock-based compensation	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$3.04M	USD	Annual
Tax withholding on stock-based compensation	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$2.62M	USD	Annual
Tax withholding on stock-based compensation	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$2.62M	USD	Annual
Net cash (used in) provided by continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-2.79M	USD	Annual
Net cash (used in) provided by continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-2.79M	USD	Annual
Net cash (used in) provided by continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$230.23M	USD	Annual
Net cash (used in) provided by continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-76.60M	USD	Annual
Net cash (used in) provided by continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-76.60M	USD	Annual
Net cash (used in) provided by continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$230.23M	USD	Annual
Net cash provided by (used in) discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$-25.61M	USD	Annual
Net cash provided by (used in) discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$-25.61M	USD	Annual
Net cash provided by (used in) discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$157.97M	USD	Annual
Net cash provided by (used in) discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$157.97M	USD	Annual
Net cash provided by (used in) discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$116.90M	USD	Annual
Net cash provided by (used in) discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	$116.90M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$204.62M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$204.62M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$40.30M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$40.30M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$155.17M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$155.17M	USD	Annual
(Decrease) increase in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$26.36M	USD	Annual
(Decrease) increase in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$26.36M	USD	Annual
(Decrease) increase in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-10.07M	USD	Annual
(Decrease) increase in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-3.54M	USD	Annual
(Decrease) increase in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-3.54M	USD	Annual
(Decrease) increase in cash, cash equivalents and restricted cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-10.07M	USD	Annual
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$66.90M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$76.97M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$76.97M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$66.90M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$80.52M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$54.16M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$54.16M	USD	Point-in-time
Cash, cash equivalents and restricted cash - beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$80.52M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$66.90M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$54.16M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$54.16M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$80.52M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$80.52M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$76.97M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$76.97M	USD	Point-in-time
Cash, cash equivalents and restricted cash - end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$66.90M	USD	Point-in-time

Stockholders Equity 68 line items

Line Item	Tag	Value	Unit	Period
Common stock, beginning balance (in shares)	`CommonStockSharesIssued`	203.69M	shares	Point-in-time
Common stock, beginning balance (in shares)	`CommonStockSharesIssued`	203.69M	shares	Point-in-time
Common stock, beginning balance (in shares)	`CommonStockSharesIssued`	203.93M	shares	Point-in-time
Common stock, beginning balance (in shares)	`CommonStockSharesIssued`	203.93M	shares	Point-in-time
Beginning balance	`StockholdersEquity`	$3.38B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.38B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$2.91B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$2.91B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.59B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$3.59B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$2.69B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$2.69B	USD	Point-in-time
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$10.42M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-107.00K	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-107.00K	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$1.59M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$1.59M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$10.42M	USD	Annual
Dividends declared on common stock	`DividendsCommonStockCash`	$142.03M	USD	Annual
Dividends declared on common stock	`DividendsCommonStockCash`	$142.03M	USD	Annual
Dividends declared on common stock	`DividendsCommonStockCash`	$178.76M	USD	Annual
Dividends declared on common stock	`DividendsCommonStockCash`	$178.76M	USD	Annual
Dividends declared on common stock	`DividendsCommonStockCash`	$104.79M	USD	Annual
Dividends declared on common stock	`DividendsCommonStockCash`	$104.79M	USD	Annual
Employee stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions`	$6.78M	USD	Annual
Employee stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions`	$6.78M	USD	Annual
Employee stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions`	$10.25M	USD	Annual
Employee stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions`	$9.57M	USD	Annual
Employee stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions`	$9.57M	USD	Annual
Employee stock-based compensation	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions`	$10.25M	USD	Annual
Repurchase of common stock	`TreasuryStockValueAcquiredCostMethod`	$4.81M	USD	Annual
Repurchase of common stock	`TreasuryStockValueAcquiredCostMethod`	$4.81M	USD	Annual
Repurchase of common stock	`TreasuryStockValueAcquiredCostMethod`	$7.40M	USD	Annual
Repurchase of common stock	`TreasuryStockValueAcquiredCostMethod`	$7.40M	USD	Annual
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	`AdjustmentsToAdditionalPaidInCapitalStockIssuedDuringPeriodValueTreasuryStockReissuedThroughShareBasedPaymentArrangement`	$-3.04M	USD	Annual
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	`AdjustmentsToAdditionalPaidInCapitalStockIssuedDuringPeriodValueTreasuryStockReissuedThroughShareBasedPaymentArrangement`	$-4.90M	USD	Annual
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	`AdjustmentsToAdditionalPaidInCapitalStockIssuedDuringPeriodValueTreasuryStockReissuedThroughShareBasedPaymentArrangement`	$-4.90M	USD	Annual
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	`AdjustmentsToAdditionalPaidInCapitalStockIssuedDuringPeriodValueTreasuryStockReissuedThroughShareBasedPaymentArrangement`	$-3.04M	USD	Annual
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	`AdjustmentsToAdditionalPaidInCapitalStockIssuedDuringPeriodValueTreasuryStockReissuedThroughShareBasedPaymentArrangement`	$-2.62M	USD	Annual
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings	`AdjustmentsToAdditionalPaidInCapitalStockIssuedDuringPeriodValueTreasuryStockReissuedThroughShareBasedPaymentArrangement`	$-2.62M	USD	Annual
Separation of Knife River and Everus	`DiscontinuedOperationValueNetEquityAdjustments`	$400.32M	USD	Annual
Separation of Knife River and Everus	`DiscontinuedOperationValueNetEquityAdjustments`	$400.32M	USD	Annual
Separation of Knife River and Everus	`DiscontinuedOperationValueNetEquityAdjustments`	$954.73M	USD	Annual
Separation of Knife River and Everus	`DiscontinuedOperationValueNetEquityAdjustments`	$954.73M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$800.00K	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$800.00K	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$7.16M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$1.33M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$1.33M	USD	Annual
Issuance of common stock	`StockIssuedDuringPeriodValueNewIssues`	$7.16M	USD	Annual
Common stock, ending balance (in shares)	`CommonStockSharesIssued`	203.69M	shares	Point-in-time
Common stock, ending balance (in shares)	`CommonStockSharesIssued`	203.69M	shares	Point-in-time
Common stock, ending balance (in shares)	`CommonStockSharesIssued`	203.93M	shares	Point-in-time
Common stock, ending balance (in shares)	`CommonStockSharesIssued`	203.93M	shares	Point-in-time
Ending balance	`StockholdersEquity`	$3.59B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.59B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$2.91B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$2.69B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.38B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$3.38B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$2.91B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$2.69B	USD	Point-in-time

Comprehensive Income 66 line items

Line Item	Tag	Value	Unit	Period
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$367.49M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Net income	`NetIncomeLoss`	$414.71M	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Net income	`NetIncomeLoss`	$281.11M	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $15 and $177 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-413.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $15 and $177 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-413.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $15 and $177 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	-	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $15 and $177 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	-	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $15 and $177 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-81.00K	USD	Annual
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $15 and $177 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-81.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, net of tax of $360, $(201) and $3,965 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-12.01M	USD	Annual
Postretirement liability gains (losses) arising during the period, net of tax of $360, $(201) and $3,965 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$646.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, net of tax of $360, $(201) and $3,965 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-12.01M	USD	Annual
Postretirement liability gains (losses) arising during the period, net of tax of $360, $(201) and $3,965 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-1.05M	USD	Annual
Postretirement liability gains (losses) arising during the period, net of tax of $360, $(201) and $3,965 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$646.00K	USD	Annual
Postretirement liability gains (losses) arising during the period, net of tax of $360, $(201) and $3,965 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax`	$-1.05M	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $145, $78 and $597 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$242.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $145, $78 and $597 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$432.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $145, $78 and $597 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$242.00K	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $145, $78 and $597 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$1.82M	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $145, $78 and $597 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$1.82M	USD	Annual
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax of $145, $78 and $597 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$432.00K	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $0, $0 and $(1,086) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetNetOfTax`	-	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $0, $0 and $(1,086) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetNetOfTax`	-	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $0, $0 and $(1,086) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetNetOfTax`	$-3.27M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $0, $0 and $(1,086) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetNetOfTax`	$-3.27M	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $0, $0 and $(1,086) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetNetOfTax`	-	USD	Annual
Reclassification of postretirement liability adjustment from regulatory asset, net of tax of $0, $0 and $(1,086) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentToAccumulatedOtherComprehensiveIncomePostretirementLiabilityAdjustmentFromRegulatoryAssetNetOfTax`	-	USD	Annual
Postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$404.00K	USD	Annual
Postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$404.00K	USD	Annual
Postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-10.56M	USD	Annual
Postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-10.56M	USD	Annual
Postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-1.48M	USD	Annual
Postretirement liability adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-1.48M	USD	Annual
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $23, $46 and $(177) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$85.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $23, $46 and $(177) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$85.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $23, $46 and $(177) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-667.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $23, $46 and $(177) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-667.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $23, $46 and $(177) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$173.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax of $23, $46 and $(177) in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$173.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $5, $11 and $31 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax`	$-43.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $5, $11 and $31 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax`	$-43.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $5, $11 and $31 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax`	$-114.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $5, $11 and $31 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax`	$-20.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $5, $11 and $31 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax`	$-20.00K	USD	Annual
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax of $5, $11 and $31 in 2024, 2023 and 2022, respectively	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax`	$-114.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$-553.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$-553.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$216.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$105.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$105.00K	USD	Annual
Net unrealized gain (loss) on available-for-sale investments	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$216.00K	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-107.00K	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-107.00K	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$1.59M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$1.59M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$10.42M	USD	Annual
Other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$10.42M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$377.91M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$414.60M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$414.60M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$282.69M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$282.69M	USD	Annual
Comprehensive income attributable to common stockholders	`ComprehensiveIncomeNetOfTax`	$377.91M	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.