10-K Filing

CLEVELAND-CLIFFS INC. CIK: 764065 FY 2017

Filing Information

Form Type	10-K
Accession Number	`0000764065-18-000035`
Period End Date	20171231
Filing Date	20180214
Fiscal Year	2017
Fiscal Period	FY
XBRL Instance	clf-20171231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 98 Income Statement 177 Cash Flow Statement 93 Stockholders Equity 49 Comprehensive Income 32

Balance Sheet 98 line items

Line Item	Tag	Value	Unit	Period
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$323.40M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.01B	USD	Point-in-time
Accounts receivable, net	`AccountsReceivableNetCurrent`	$128.70M	USD	Point-in-time
Accounts receivable, net	`AccountsReceivableNetCurrent`	$140.60M	USD	Point-in-time
Inventories	`InventoryNet`	$183.40M	USD	Point-in-time
Inventories	`InventoryNet`	$178.40M	USD	Point-in-time
Supplies and other inventories	`Supplies`	$93.90M	USD	Point-in-time
Supplies and other inventories	`Supplies`	$91.40M	USD	Point-in-time
Derivative assets	`DerivativeAssetsCurrent`	$39.40M	USD	Point-in-time
Derivative assets	`DerivativeAssetsCurrent`	$33.10M	USD	Point-in-time
Preferred stock, par value	`PreferredStockParOrStatedValuePerShare`	-	USD	Point-in-time
Preferred stock, par value	`PreferredStockParOrStatedValuePerShare`	-	USD	Point-in-time
Loans to and accounts receivables from the Canadian Entities	`LoanstoandaccountsreceivablesfromtheCanadianEntities`	$48.60M	USD	Point-in-time
Loans to and accounts receivables from the Canadian Entities	`LoanstoandaccountsreceivablesfromtheCanadianEntities`	$51.60M	USD	Point-in-time
Cumulative Mandatory Convertible	`CumulativeMandatoryConvertible`	0.07	pure	Point-in-time
Cumulative Mandatory Convertible	`CumulativeMandatoryConvertible`	0.07	pure	Point-in-time
Other current assets	`OtherAssetsCurrent`	$28.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$21.00M	USD	Point-in-time
TOTAL CURRENT ASSETS	`AssetsCurrent`	$824.60M	USD	Point-in-time
TOTAL CURRENT ASSETS	`AssetsCurrent`	$1.54B	USD	Point-in-time
PROPERTY, PLANT AND EQUIPMENT, NET	`PropertyPlantAndEquipmentNet`	$984.40M	USD	Point-in-time
PROPERTY, PLANT AND EQUIPMENT, NET	`PropertyPlantAndEquipmentNet`	$1.06B	USD	Point-in-time
PROPERTY, PLANT AND EQUIPMENT, NET	`PropertyPlantAndEquipmentNet`	$1.05B	USD	Point-in-time
Common shares, par value	`CommonStockParOrStatedValuePerShare`	$0.12	USD	Point-in-time
Common shares, par value	`CommonStockParOrStatedValuePerShare`	$0.12	USD	Point-in-time
INCOME TAX RECEIVABLE	`IncomeTaxReceivable`	-	USD	Point-in-time
Common shares, authorized (in shares)	`CommonStockSharesAuthorized`	400.00M	shares	Point-in-time
Common shares, authorized (in shares)	`CommonStockSharesAuthorized`	600.00M	shares	Point-in-time
INCOME TAX RECEIVABLE	`IncomeTaxReceivable`	$235.30M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$114.90M	USD	Point-in-time
Common shares, issued (in shares)	`CommonStockSharesIssued`	301.89M	shares	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$122.50M	USD	Point-in-time
Common shares, issued (in shares)	`CommonStockSharesIssued`	238.64M	shares	Point-in-time
TOTAL ASSETS	`Assets`	$2.14B	USD	Point-in-time
TOTAL ASSETS	`Assets`	$1.92B	USD	Point-in-time
Common shares, outstanding	`CommonStockSharesOutstanding`	297.40M	shares	Point-in-time
Common shares, outstanding	`CommonStockSharesOutstanding`	233.07M	shares	Point-in-time
TOTAL ASSETS	`Assets`	$2.95B	USD	Point-in-time
Common shares in treasury	`TreasuryStockShares`	5.56M	shares	Point-in-time
Common shares in treasury	`TreasuryStockShares`	4.49M	shares	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$107.60M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$127.70M	USD	Point-in-time
Accrued employment costs	`EmployeeRelatedLiabilitiesCurrent`	$56.10M	USD	Point-in-time
Accrued employment costs	`EmployeeRelatedLiabilitiesCurrent`	$56.10M	USD	Point-in-time
State and local taxes payable	`TaxesPayableCurrent`	$28.30M	USD	Point-in-time
State and local taxes payable	`TaxesPayableCurrent`	$30.20M	USD	Point-in-time
Accrued expenses	`AccruedLiabilitiesCurrent`	$33.70M	USD	Point-in-time
Accrued expenses	`AccruedLiabilitiesCurrent`	$41.10M	USD	Point-in-time
Accrued interest	`InterestPayableCurrent`	$31.40M	USD	Point-in-time
Accrued interest	`InterestPayableCurrent`	$40.20M	USD	Point-in-time
Accrued royalties	`AccruedRoyaltiesCurrent`	$26.20M	USD	Point-in-time
Accrued royalties	`AccruedRoyaltiesCurrent`	$17.30M	USD	Point-in-time
Contingent claims	`ReserveforunassertedclaimsinCCAA`	$55.60M	USD	Point-in-time
Contingent claims	`ReserveforunassertedclaimsinCCAA`	-	USD	Point-in-time
Partnership distribution payable	`ShortTermNonBankLoansAndNotesPayable`	$44.20M	USD	Point-in-time
Partnership distribution payable	`ShortTermNonBankLoansAndNotesPayable`	$8.70M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$82.90M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$56.00M	USD	Point-in-time
TOTAL CURRENT LIABILITIES	`LiabilitiesCurrent`	$391.10M	USD	Point-in-time
TOTAL CURRENT LIABILITIES	`LiabilitiesCurrent`	$452.20M	USD	Point-in-time
Pensions	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$245.70M	USD	Point-in-time
Pensions	`DefinedBenefitPensionPlanLiabilitiesNoncurrent`	$222.80M	USD	Point-in-time
Other postretirement benefits	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$34.90M	USD	Point-in-time
Other postretirement benefits	`OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent`	$34.80M	USD	Point-in-time
TOTAL POSTEMPLOYMENT BENEFIT LIABILITIES	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$257.70M	USD	Point-in-time
TOTAL POSTEMPLOYMENT BENEFIT LIABILITIES	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$280.50M	USD	Point-in-time
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS	`MineReclamationAndClosingLiabilityNoncurrent`	$193.90M	USD	Point-in-time
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS	`MineReclamationAndClosingLiabilityNoncurrent`	$196.50M	USD	Point-in-time
LONG-TERM DEBT	`LongTermDebtNoncurrent`	$2.18B	USD	Point-in-time
LONG-TERM DEBT	`LongTermDebtNoncurrent`	$2.30B	USD	Point-in-time
OTHER LIABILITIES	`OtherLiabilitiesNoncurrent`	$186.90M	USD	Point-in-time
OTHER LIABILITIES	`OtherLiabilitiesNoncurrent`	$213.80M	USD	Point-in-time
TOTAL LIABILITIES	`Liabilities`	$3.25B	USD	Point-in-time
TOTAL LIABILITIES	`Liabilities`	$3.40B	USD	Point-in-time
COMMITMENTS AND CONTINGENCIES (SEE NOTE 20)	`CommitmentsAndContingencies`	-	USD	Point-in-time
COMMITMENTS AND CONTINGENCIES (SEE NOTE 20)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common Shares - par value $0.125 per share, Authorized - 600,000,000 shares (2016 - 400,000,000 shares); Issued - 238,636,794 shares (2016 - 238,636,794) shares); Outstanding - 233,074,091 shares (2016 - 233,074,091) shares)	`CommonStockValueOutstanding`	$37.70M	USD	Point-in-time
Common Shares - par value $0.125 per share, Authorized - 600,000,000 shares (2016 - 400,000,000 shares); Issued - 238,636,794 shares (2016 - 238,636,794) shares); Outstanding - 233,074,091 shares (2016 - 233,074,091) shares)	`CommonStockValueOutstanding`	$29.80M	USD	Point-in-time
Capital in excess of par value of shares	`AdditionalPaidInCapital`	$3.93B	USD	Point-in-time
Capital in excess of par value of shares	`AdditionalPaidInCapital`	$3.35B	USD	Point-in-time
Retained deficit	`RetainedEarningsAccumulatedDeficit`	$-4.57B	USD	Point-in-time
Retained deficit	`RetainedEarningsAccumulatedDeficit`	$-4.21B	USD	Point-in-time
Cost of 4,485,826 common shares in treasury (2016 - 5,562,703 shares)	`TreasuryStockValue`	$169.60M	USD	Point-in-time
Cost of 4,485,826 common shares in treasury (2016 - 5,562,703 shares)	`TreasuryStockValue`	$245.50M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-39.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-18.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-245.80M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-21.30M	USD	Point-in-time
TOTAL CLIFFS SHAREHOLDERS' DEFICIT	`StockholdersEquity`	$-444.30M	USD	Point-in-time
TOTAL CLIFFS SHAREHOLDERS' DEFICIT	`StockholdersEquity`	$-1.46B	USD	Point-in-time
NONCONTROLLING INTEREST	`MinorityInterest`	$200.00K	USD	Point-in-time
NONCONTROLLING INTEREST	`MinorityInterest`	$133.80M	USD	Point-in-time
TOTAL DEFICIT	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.33B	USD	Point-in-time
TOTAL DEFICIT	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-444.10M	USD	Point-in-time
TOTAL DEFICIT	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.81B	USD	Point-in-time
TOTAL DEFICIT	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.73B	USD	Point-in-time
TOTAL LIABILITIES AND DEFICIT	`LiabilitiesAndStockholdersEquity`	$1.92B	USD	Point-in-time
TOTAL LIABILITIES AND DEFICIT	`LiabilitiesAndStockholdersEquity`	$2.95B	USD	Point-in-time

Income Statement 177 line items

Line Item	Tag	Value	Unit	Period
Product	`SalesRevenueGoodsNet`	$1.83B	USD	Annual
Product	`SalesRevenueGoodsNet`	$2.09B	USD	Annual
Product	`SalesRevenueGoodsNet`	$1.91B	USD	Annual
Freight and venture partners' cost reimbursements	`ReimbursementRevenue`	$180.90M	USD	Annual
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest`	-	USD	Annual
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest`	-	USD	Annual
Freight and venture partners' cost reimbursements	`ReimbursementRevenue`	$241.00M	USD	Annual
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest`	$7.70M	USD	Annual
Freight and venture partners' cost reimbursements	`ReimbursementRevenue`	$195.50M	USD	Annual
TOTAL REVENUES	`Revenues`	$305.50M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$754.00M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$2.11B	USD	Annual
TOTAL REVENUES	`Revenues`	$461.60M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$553.30M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$496.20M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$698.40M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$600.90M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$2.01B	USD	Annual
TOTAL REVENUES	`Revenues`	$569.30M	USD	1 Quarter
TOTAL REVENUES	`Revenues`	$2.33B	USD	Annual
COST OF GOODS SOLD AND OPERATING EXPENSES	`CostOfGoodsAndServicesSold`	$1.72B	USD	Annual
COST OF GOODS SOLD AND OPERATING EXPENSES	`CostOfGoodsAndServicesSold`	$1.83B	USD	Annual
COST OF GOODS SOLD AND OPERATING EXPENSES	`CostOfGoodsAndServicesSold`	$1.78B	USD	Annual
SALES MARGIN	`GrossProfit`	$389.30M	USD	Annual
SALES MARGIN	`GrossProfit`	$501.70M	USD	Annual
SALES MARGIN	`GrossProfit`	$85.40M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$236.50M	USD	Annual
SALES MARGIN	`GrossProfit`	$30.90M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$95.70M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$100.70M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$160.20M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$145.10M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$181.50M	USD	1 Quarter
SALES MARGIN	`GrossProfit`	$91.50M	USD	1 Quarter
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$105.80M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$110.00M	USD	Annual
Selling, general and administrative expenses	`SellingGeneralAndAdministrativeExpense`	$117.80M	USD	Annual
Miscellaneous - net	`OtherOperatingIncomeExpenseNet`	$24.80M	USD	Annual
Miscellaneous - net	`OtherOperatingIncomeExpenseNet`	$27.70M	USD	Annual
Miscellaneous - net	`OtherOperatingIncomeExpenseNet`	$-30.70M	USD	Annual
Other operating expense	`OperatingExpenses`	$85.20M	USD	Annual
Other operating expense	`OperatingExpenses`	$78.10M	USD	Annual
Other operating expense	`OperatingExpenses`	$148.50M	USD	Annual
OPERATING INCOME	`OperatingIncomeLoss`	$423.60M	USD	Annual
OPERATING INCOME	`OperatingIncomeLoss`	$240.80M	USD	Annual
OPERATING INCOME	`OperatingIncomeLoss`	$151.30M	USD	Annual
Interest expense, net	`InterestIncomeExpenseNet`	$-228.50M	USD	Annual
Interest expense, net	`InterestIncomeExpenseNet`	$-200.50M	USD	Annual
Interest expense, net	`InterestIncomeExpenseNet`	$-132.00M	USD	Annual
Gain (loss) on extinguishment/restructuring of debt	`GainsLossesOnExtinguishmentOfDebt`	$174.30M	USD	1 Quarter
Gain (loss) on extinguishment/restructuring of debt	`GainsLossesOnExtinguishmentOfDebt`	$392.90M	USD	Annual
Gain (loss) on extinguishment/restructuring of debt	`GainsLossesOnExtinguishmentOfDebt`	$166.30M	USD	Annual
Gain (loss) on extinguishment/restructuring of debt	`GainsLossesOnExtinguishmentOfDebt`	$-165.40M	USD	Annual
Other non-operating income (expense)	`OtherNonoperatingIncomeExpense`	$400.00K	USD	Annual
Other non-operating income (expense)	`OtherNonoperatingIncomeExpense`	$3.20M	USD	Annual
Other non-operating income (expense)	`OtherNonoperatingIncomeExpense`	$-2.60M	USD	Annual
TOTAL OTHER INCOME (EXPENSE)	`NonoperatingIncomeExpense`	$-294.20M	USD	Annual
TOTAL OTHER INCOME (EXPENSE)	`NonoperatingIncomeExpense`	$-33.80M	USD	Annual
TOTAL OTHER INCOME (EXPENSE)	`NonoperatingIncomeExpense`	$161.80M	USD	Annual
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$207.00M	USD	Annual
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$129.40M	USD	Annual
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$313.10M	USD	Annual
INCOME TAX BENEFIT (EXPENSE)	`IncomeTaxExpenseBenefit`	$-252.40M	USD	Annual
INCOME TAX BENEFIT (EXPENSE)	`IncomeTaxExpenseBenefit`	$-12.20M	USD	Annual
INCOME TAX BENEFIT (EXPENSE)	`IncomeTaxExpenseBenefit`	$169.30M	USD	Annual
EQUITY LOSS FROM VENTURES, net of tax	`IncomeLossFromEquityMethodInvestments`	-	USD	Annual
EQUITY LOSS FROM VENTURES, net of tax	`IncomeLossFromEquityMethodInvestments`	-	USD	Annual
EQUITY LOSS FROM VENTURES, net of tax	`IncomeLossFromEquityMethodInvestments`	$-100.00K	USD	Annual
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$20.60M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$219.20M	USD	Annual
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$315.00M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$381.80M	USD	Annual
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$100.10M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$76.50M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$29.90M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$-30.30M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$-25.10M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$114.30M	USD	1 Quarter
INCOME FROM CONTINUING OPERATIONS	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$143.70M	USD	Annual
LOSS FROM DISCONTINUED OPERATIONS, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-892.10M	USD	Annual
LOSS FROM DISCONTINUED OPERATIONS, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-18.70M	USD	Annual
LOSS FROM DISCONTINUED OPERATIONS, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-19.90M	USD	Annual
NET INCOME (LOSS)	`ProfitLoss`	$199.30M	USD	Annual
NET INCOME (LOSS)	`ProfitLoss`	$363.10M	USD	Annual
NET INCOME (LOSS)	`ProfitLoss`	$-748.40M	USD	Annual
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	`NetIncomeLossAttributableToNoncontrollingInterest`	$25.20M	USD	Annual
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	`NetIncomeLossAttributableToNoncontrollingInterest`	$900.00K	USD	Annual
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	`NetIncomeLossAttributableToNoncontrollingInterest`	$-3.90M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$-749.30M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$-25.80M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$174.10M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$309.90M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$31.80M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$-28.10M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$53.40M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$108.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$79.10M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$12.80M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$367.00M	USD	Annual
PREFERRED STOCK DIVIDENDS	`DividendsPreferredStock`	-	USD	Annual
PREFERRED STOCK DIVIDENDS	`DividendsPreferredStock`	-	USD	Annual
PREFERRED STOCK DIVIDENDS	`DividendsPreferredStock`	$38.40M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS	`NetIncomeLossAvailableToCommonStockholdersBasic`	$174.10M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS	`NetIncomeLossAvailableToCommonStockholdersBasic`	$367.00M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS	`NetIncomeLossAvailableToCommonStockholdersBasic`	$-787.70M	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.98	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.26	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.07	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$-0.11	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.34	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.61	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.06	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.07	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$-0.11	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.43	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.63	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.16	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	-	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.02	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.01	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.11	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-5.77	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.10	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	-	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.01	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.06	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.08	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$0.18	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$0.62	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$0.35	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$1.04	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$0.07	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$-0.11	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$-0.12	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$0.88	USD	Annual
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$-5.14	USD	Annual
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$1.28	USD	Annual
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	`EarningsPerShareBasic`	$0.10	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.61	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.07	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.32	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.63	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.42	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.07	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$-0.11	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.26	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$-0.11	USD	1 Quarter
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.97	USD	Annual
Continuing operations	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.05	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.01	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.01	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.02	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.08	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.10	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.15	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-5.76	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.06	USD	Annual
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	1 Quarter
Discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.11	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$-0.12	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$0.34	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$0.87	USD	Annual
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$-0.11	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$0.07	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$0.62	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$0.18	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$1.26	USD	Annual
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$0.11	USD	1 Quarter
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$-5.13	USD	Annual
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	`EarningsPerShareDiluted`	$1.03	USD	1 Quarter
Basic	`WeightedAverageNumberOfSharesOutstandingBasic`	288.40M	shares	Annual
Basic	`WeightedAverageNumberOfSharesOutstandingBasic`	197.70M	shares	Annual
Basic	`WeightedAverageNumberOfSharesOutstandingBasic`	153.20M	shares	Annual
Diluted	`WeightedAverageNumberOfDilutedSharesOutstanding`	293.00M	shares	Annual
Diluted	`WeightedAverageNumberOfDilutedSharesOutstanding`	200.10M	shares	Annual
Diluted	`WeightedAverageNumberOfDilutedSharesOutstanding`	153.60M	shares	Annual

Cash Flow Statement 93 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`ProfitLoss`	$199.30M	USD	Annual
Net income (loss)	`ProfitLoss`	$363.10M	USD	Annual
Net income (loss)	`ProfitLoss`	$-748.40M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$87.70M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$115.40M	USD	Annual
Depreciation, depletion and amortization	`DepreciationDepletionAndAmortization`	$134.00M	USD	Annual
Impairment of long-lived assets	`AssetImpairmentChargesCashFlows`	-	USD	Annual
Impairment of long-lived assets	`AssetImpairmentChargesCashFlows`	-	USD	Annual
Impairment of long-lived assets	`AssetImpairmentChargesCashFlows`	$76.60M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	-	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	-	USD	Annual
Deferred income taxes	`DeferredIncomeTaxExpenseBenefit`	$159.80M	USD	Annual
Loss (gain) on extinguishment/restructuring of debt	`Gainonextinguishmentofdebtcashflows`	$-392.90M	USD	Annual
Loss (gain) on extinguishment/restructuring of debt	`Gainonextinguishmentofdebtcashflows`	$165.40M	USD	Annual
Loss (gain) on extinguishment/restructuring of debt	`Gainonextinguishmentofdebtcashflows`	$-166.30M	USD	Annual
Loss on deconsolidation, net of cash deconsolidated	`LossonDeconsolidationnetofcashdeconsolidated`	$-17.50M	USD	Annual
Loss on deconsolidation, net of cash deconsolidated	`LossonDeconsolidationnetofcashdeconsolidated`	$-668.30M	USD	Annual
Loss on deconsolidation, net of cash deconsolidated	`LossonDeconsolidationnetofcashdeconsolidated`	$-20.20M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-21.20M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-61.10M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-10.00M	USD	Annual
Receivables and other assets	`IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets`	$-43.20M	USD	Annual
Receivables and other assets	`IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets`	$-369.10M	USD	Annual
Receivables and other assets	`IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets`	$248.70M	USD	Annual
Product inventories	`IncreaseDecreaseInInventories`	$-157.80M	USD	Annual
Product inventories	`IncreaseDecreaseInInventories`	$1.80M	USD	Annual
Product inventories	`IncreaseDecreaseInInventories`	$62.00M	USD	Annual
Payables and accrued expenses	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-73.90M	USD	Annual
Payables and accrued expenses	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-227.70M	USD	Annual
Payables and accrued expenses	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-69.00M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$338.10M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$303.00M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$37.90M	USD	Annual
Purchase of property, plant and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$151.70M	USD	Annual
Purchase of property, plant and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$69.10M	USD	Annual
Purchase of property, plant and equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$80.80M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$4.30M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-11.20M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$22.40M	USD	Annual
Net cash used by investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-103.20M	USD	Annual
Net cash used by investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-57.90M	USD	Annual
Net cash used by investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-156.00M	USD	Annual
Net proceeds from issuance of common shares	`ProceedsFromIssuanceOfCommonStock`	$661.30M	USD	Annual
Net proceeds from issuance of common shares	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Net proceeds from issuance of common shares	`ProceedsFromIssuanceOfCommonStock`	$287.40M	USD	Annual
Net proceeds from issuance of common shares	`ProceedsFromIssuanceOfCommonStock`	$287.60M	USD	3 Qtrs
Proceeds from issuance of debt	`ProceedsFromIssuanceOfSeniorLongTermDebt`	$503.50M	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfSeniorLongTermDebt`	$1.77B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfSeniorLongTermDebt`	-	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$5.20M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$28.60M	USD	Annual
Debt issuance costs	`PaymentsOfDebtIssuanceCosts`	$33.60M	USD	Annual
Borrowings under credit facilities	`ProceedsFromLongTermLinesOfCredit`	-	USD	Annual
Borrowings under credit facilities	`ProceedsFromLongTermLinesOfCredit`	$105.00M	USD	Annual
Borrowings under credit facilities	`ProceedsFromLongTermLinesOfCredit`	$309.80M	USD	Annual
Repayment under credit facilities	`RepaymentsOfLongTermLinesOfCredit`	-	USD	Annual
Repayment under credit facilities	`RepaymentsOfLongTermLinesOfCredit`	$309.80M	USD	Annual
Repayment under credit facilities	`RepaymentsOfLongTermLinesOfCredit`	$105.00M	USD	Annual
Repayments on equipment loans	`Repaymentsofequipmentloans`	$45.40M	USD	Annual
Repayments on equipment loans	`Repaymentsofequipmentloans`	-	USD	Annual
Repayments on equipment loans	`Repaymentsofequipmentloans`	$95.60M	USD	Annual
Repurchase of debt	`GainLossOnRepurchaseOfDebtInstrument`	$305.40M	USD	Annual
Repurchase of debt	`GainLossOnRepurchaseOfDebtInstrument`	$1.72B	USD	Annual
Repurchase of debt	`GainLossOnRepurchaseOfDebtInstrument`	$225.90M	USD	Annual
Acquisition of noncontrolling interest	`PaymentsForRepurchaseOfRedeemableNoncontrollingInterest`	-	USD	Annual
Acquisition of noncontrolling interest	`PaymentsForRepurchaseOfRedeemableNoncontrollingInterest`	-	USD	Annual
Acquisition of noncontrolling interest	`PaymentsForRepurchaseOfRedeemableNoncontrollingInterest`	$105.00M	USD	Annual
Distributions of partnership equity	`PaymentsOfDistributionsToAffiliates`	$52.90M	USD	Annual
Distributions of partnership equity	`PaymentsOfDistributionsToAffiliates`	$40.60M	USD	Annual
Distributions of partnership equity	`PaymentsOfDistributionsToAffiliates`	$59.90M	USD	Annual
Preferred stock dividends	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$51.20M	USD	Annual
Preferred stock dividends	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	Annual
Preferred stock dividends	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	-	USD	Annual
Other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-26.70M	USD	Annual
Other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-27.70M	USD	Annual
Other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-45.80M	USD	Annual
Net cash provided (used) by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$61.00M	USD	Annual
Net cash provided (used) by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$498.90M	USD	Annual
Net cash provided (used) by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-206.40M	USD	Annual
EFFECT OF EXCHANGE RATE CHANGES ON CASH	`EffectOfExchangeRateOnCashAndCashEquivalents`	$3.30M	USD	Annual
EFFECT OF EXCHANGE RATE CHANGES ON CASH	`EffectOfExchangeRateOnCashAndCashEquivalents`	$-500.00K	USD	Annual
EFFECT OF EXCHANGE RATE CHANGES ON CASH	`EffectOfExchangeRateOnCashAndCashEquivalents`	$-1.40M	USD	Annual
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-5.70M	USD	Annual
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$684.30M	USD	Annual
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$38.20M	USD	Annual
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$285.20M	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$1.01B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$290.90M	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$323.40M	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT END OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$285.20M	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT END OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$1.01B	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT END OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$290.90M	USD	Point-in-time
CASH AND CASH EQUIVALENTS AT END OF YEAR	`CashAndCashEquivalentsAtCarryingValueIncludingAssetsHeldForSale`	$323.40M	USD	Point-in-time

Stockholders Equity 49 line items

Line Item	Tag	Value	Unit	Period
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	-	USD	Annual
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	-	USD	Annual
Preferred stock dividends per share	`PreferredStockDividendsPerShareCashPaid`	$1.32	USD	Annual
Balance, beginning of period (in shares)	`CommonStockSharesOutstanding`	297.40M	shares	Point-in-time
Balance, beginning of period (in shares)	`CommonStockSharesOutstanding`	233.07M	shares	Point-in-time
Balance, beginning of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.33B	USD	Point-in-time
Balance, beginning of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-444.10M	USD	Point-in-time
Balance, beginning of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.81B	USD	Point-in-time
Balance, beginning of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.73B	USD	Point-in-time
NET INCOME (LOSS)	`ProfitLoss`	$199.30M	USD	Annual
NET INCOME (LOSS)	`ProfitLoss`	$363.10M	USD	Annual
NET INCOME (LOSS)	`ProfitLoss`	$-748.40M	USD	Annual
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$266.20M	USD	Annual
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-4.00M	USD	Annual
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-3.30M	USD	Annual
OTHER COMPREHENSIVE INCOME	`OtherComprehensiveIncomeLossNetOfTax`	$223.20M	USD	Annual
OTHER COMPREHENSIVE INCOME	`OtherComprehensiveIncomeLossNetOfTax`	$-3.80M	USD	Annual
OTHER COMPREHENSIVE INCOME	`OtherComprehensiveIncomeLossNetOfTax`	$-2.90M	USD	Annual
Pension and OPEB liability, net of tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$19.80M	USD	Annual
Pension and OPEB liability, net of tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-45.20M	USD	Annual
Pension and OPEB liability, net of tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-11.50M	USD	Annual
Total comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$-525.20M	USD	Annual
Total comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$360.20M	USD	Annual
Total comprehensive income (loss)	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$195.50M	USD	Annual
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	`AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature`	$83.40M	USD	Annual
Capital contribution by noncontrolling interest to subsidiary	`ProceedsFromMinorityShareholders`	$200.00K	USD	Annual
Undistributed losses to noncontrolling interest to subsidiary	`UndistributedEarningsLossesRelatedToNoncontrollingInterests`	$-3.20M	USD	Annual
Undistributed losses to noncontrolling interest to subsidiary	`UndistributedEarningsLossesRelatedToNoncontrollingInterests`	$-200.00K	USD	Annual
Undistributed losses to noncontrolling interest to subsidiary	`UndistributedEarningsLossesRelatedToNoncontrollingInterests`	$1.80M	USD	Annual
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$128.80M	USD	Annual
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$51.70M	USD	Annual
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$57.50M	USD	Annual
Deconsolidation, Gain (Loss), Amount	`DeconsolidationGainOrLossAmount`	$-528.20M	USD	Annual
Stock and other incentive plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$9.80M	USD	Annual
Stock and other incentive plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$13.50M	USD	Annual
Stock and other incentive plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$13.70M	USD	Annual
Preferred Stock Dividends	`PreferredStockDividends`	$38.40M	USD	Annual
Debt for equity exchange (value)	`Debtforequityexchangevalue`	$45.20M	USD	Annual
Common Stock, New Shares, Issued	`CommonStockNewSharesIssued`	44.40M	shares	1 Quarter
Common Stock, New Shares, Issued	`CommonStockNewSharesIssued`	63.25M	shares	1 Quarter
Common stock issuance (value)	`Commonstockissuancevalue`	$287.40M	USD	Annual
Common stock issuance (value)	`Commonstockissuancevalue`	$661.30M	USD	Annual
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	`MinorityInterestDecreaseFromRedemptions`	$-105.00M	USD	Annual
Balance, end of period (in shares)	`CommonStockSharesOutstanding`	297.40M	shares	Point-in-time
Balance, end of period (in shares)	`CommonStockSharesOutstanding`	233.07M	shares	Point-in-time
Balance, end of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.33B	USD	Point-in-time
Balance, end of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-444.10M	USD	Point-in-time
Balance, end of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.81B	USD	Point-in-time
Balance, end of period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-1.73B	USD	Point-in-time

Comprehensive Income 32 line items

Line Item	Tag	Value	Unit	Period
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$-749.30M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$-25.80M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$174.10M	USD	Annual
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$309.90M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$31.80M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$-28.10M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$53.40M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$108.00M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$79.10M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$12.80M	USD	1 Quarter
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`NetIncomeLoss`	$367.00M	USD	Annual
Pension and OPEB liability, net of tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$19.80M	USD	Annual
Pension and OPEB liability, net of tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-45.20M	USD	Annual
Pension and OPEB liability, net of tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-11.50M	USD	Annual
Unrealized net gain on marketable securities, net of tax	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	-	USD	Annual
Unrealized net gain on marketable securities, net of tax	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$1.70M	USD	Annual
Unrealized net gain on marketable securities, net of tax	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	-	USD	Annual
Unrealized net gain (loss) on foreign currency translation	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-13.90M	USD	Annual
Unrealized net gain (loss) on foreign currency translation	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$18.60M	USD	Annual
Unrealized net gain (loss) on foreign currency translation	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$155.60M	USD	Annual
Unrealized net gain (loss) on derivative financial instruments, net of tax	`OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax`	$20.70M	USD	Annual
Unrealized net gain (loss) on derivative financial instruments, net of tax	`OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax`	$-500.00K	USD	Annual
Unrealized net gain (loss) on derivative financial instruments, net of tax	`OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax`	$-2.60M	USD	Annual
OTHER COMPREHENSIVE INCOME (LOSS)	`OtherComprehensiveIncomeLossNetOfTax`	$223.20M	USD	Annual
OTHER COMPREHENSIVE INCOME (LOSS)	`OtherComprehensiveIncomeLossNetOfTax`	$-3.80M	USD	Annual
OTHER COMPREHENSIVE INCOME (LOSS)	`OtherComprehensiveIncomeLossNetOfTax`	$-2.90M	USD	Annual
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-500.00K	USD	Annual
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$1.10M	USD	Annual
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-4.60M	USD	Annual
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`ComprehensiveIncomeNetOfTax`	$363.00M	USD	Annual
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`ComprehensiveIncomeNetOfTax`	$-521.50M	USD	Annual
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	`ComprehensiveIncomeNetOfTax`	$170.80M	USD	Annual

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