AG真人平台AG真人试玩

Annual report pursuant to Section 13 and 15(d)

Statements of Consolidated Changes in Equity

v2.4.1.9
Statements of Consolidated Changes in Equity (USD $)
In Millions, except Share data, unless otherwise specified
Total
USD ($)
Depositary Shares [Member]
USD ($)
Common Stock [Member]
USD ($)
Capital in Excess of Par Value of Shares [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Common Shares in Treasury [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Noncontrolling Interest [Member]
USD ($)
Depositary Shares [Member]
USD ($)
Depositary Shares [Member]
Capital in Excess of Par Value of Shares [Member]
USD ($)
Common Stock [Member]
Common Stock [Member]
Capital in Excess of Par Value of Shares [Member]
USD ($)
Balance, beginning of period at Dec. 31, 2011 $ 7,039.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 听 $ 18.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		$ 1,770.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		$ 4,424.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		$ (336.0)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		$ (92.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		$ 1,254.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Balance, beginning of period (in shares) at Dec. 31, 2011 听 听 142,000,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] 听 听 听 听 听 听 听 听 听 听 听 听
NET INCOME (LOSS) (1,126.6)us-gaap_ProfitLoss 听 听 听 (899.4)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 (227.2)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 862.4us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 听 听 听 听 听 37.0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 听 听 听 听 听 听 听 7.6us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Other Comprehensive Income (Loss), Net of Tax 44.6us-gaap_OtherComprehensiveIncomeLossNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Pension and OPEB liability, net of tax 33.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Unrealized net loss on marketable securities, net of tax (0.5)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Total comprehensive income (loss) (1,082.0)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 听 听 听 听 听 听 (219.6)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Purchase of subsidiary shares from noncontrolling interest (2.1)us-gaap_MinorityInterestDecreaseFromRedemptions 听 听 听 听 听 听 (2.1)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Undistributed losses to noncontrolling interest to subsidiary 0.4clf_UndistributedEarningsLossesRelatedToNoncontrollingInterests 听 听 听 听 听 听 0.4clf_UndistributedEarningsLossesRelatedToNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Capital contribution by noncontrolling interest to subsidiary 104.4us-gaap_ProceedsFromMinorityShareholders 听 听 1.6us-gaap_ProceedsFromMinorityShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		听 听 听 102.8us-gaap_ProceedsFromMinorityShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Stock Issued During Period, Value, Acquisitions (8.0)us-gaap_StockIssuedDuringPeriodValueAcquisitions 听 听 听 听 听 听 (8.0)us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Stock and other incentive plans (in shares) 听 听 500,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Stock and other incentive plans 15.7us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 听 听 2.3us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		听 13.4us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		听 听 听 听 听 听
Common stock dividends ($0.60 per share) (307.2)us-gaap_DividendsCommonStock 听 听 听 (307.2)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 听 听 听 听 听
Preferred stock dividends ($1.66 per depositary share) 0us-gaap_DividendsPreferredStock 听 听 听 听 听 听 听 听 听 听 听
Balance, end of period at Dec. 31, 2012 5,760.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 听 18.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		1,774.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		3,217.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		(322.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		(55.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		1,128.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Balance, end of period (in shares) at Dec. 31, 2012 听 听 142,500,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] 听 听 听 听 听 听 听 听 听 听 听 听
NET INCOME (LOSS) 361.8us-gaap_ProfitLoss 听 听 听 413.5us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 (51.7)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (356.2)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 听 听 听 听 听 (57.3)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 听 听 听 听 听 听 听 30.5us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Other Comprehensive Income (Loss), Net of Tax (26.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Pension and OPEB liability, net of tax 208.3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Unrealized net loss on marketable securities, net of tax 3.1us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Total comprehensive income (loss) 335.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 听 听 听 听 听 听 (21.2)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Equity offering (in shares) 听 29,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		10,400,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Equity offering 285.3us-gaap_StockIssuedDuringPeriodValueNewIssues 731.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		1.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 709.4us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember 		(21.9)us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= clf_DepositarySharesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		听 284.0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
Purchase of subsidiary shares from noncontrolling interest 听 听 听 295.4us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		(82.7)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 听 听 听 听 听
Undistributed losses to noncontrolling interest to subsidiary 17.0clf_UndistributedEarningsLossesRelatedToNoncontrollingInterests 听 听 听 听 听 听 17.0clf_UndistributedEarningsLossesRelatedToNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Capital contribution by noncontrolling interest to subsidiary 5.2us-gaap_ProceedsFromMinorityShareholders 听 听 0.2us-gaap_ProceedsFromMinorityShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		(0.6)us-gaap_ProceedsFromMinorityShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 5.6us-gaap_ProceedsFromMinorityShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Stock Issued During Period, Value, Acquisitions (102.1)us-gaap_StockIssuedDuringPeriodValueAcquisitions 听 听 听 听 听 听 (314.8)us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Stock and other incentive plans (in shares) 听 听 300,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Stock and other incentive plans 14.2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 听 听 (2.9)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		听 17.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		听 听 听 听 听 听
Common stock dividends ($0.60 per share) (91.9)us-gaap_DividendsCommonStock 听 听 听 (91.9)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 听 听 听 听 听
Preferred stock dividends ($1.66 per depositary share) (48.7)us-gaap_DividendsPreferredStock 听 听 听 (48.7)us-gaap_DividendsPreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 听 听 听 听 听
Preferred Stock, Shares Outstanding 听 29,300,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		听 听 听 听 听 听 听 听 听 听
Balance, end of period at Dec. 31, 2013 6,884.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 731.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		19.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		2,329.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		3,407.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		(305.5)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		(112.9)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		814.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Balance, end of period (in shares) at Dec. 31, 2013 153,126,291us-gaap_CommonStockSharesOutstanding 听 153,200,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] 听 听 听 听 听 听 听 听 听 听 听 听
NET INCOME (LOSS) (8,311.6)us-gaap_ProfitLoss 听 听 听 (7,224.2)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 (1,087.4)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 7,357.1us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 听 听 听 听 听 (132.9)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 听 听 听 听 听 听 听 (4.8)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Other Comprehensive Income (Loss), Net of Tax (137.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Pension and OPEB liability, net of tax (91.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Unrealized net loss on marketable securities, net of tax (7.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 听 听 听 听 听 听 听 听 听 听 听
Total comprehensive income (loss) (8,449.3)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 听 听 听 听 听 听 (1,092.2)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Undistributed losses to noncontrolling interest to subsidiary (25.5)clf_UndistributedEarningsLossesRelatedToNoncontrollingInterests 听 听 听 听 听 听 (25.5)clf_UndistributedEarningsLossesRelatedToNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Capital contribution by noncontrolling interest to subsidiary (0.1)us-gaap_ProceedsFromMinorityShareholders 听 听 听 听 听 听 (0.1)us-gaap_ProceedsFromMinorityShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Stock and other incentive plans 0.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 听 听 (19.7)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		听 19.8us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		听 听 听 听 听 听
Common stock dividends ($0.60 per share) (92.5)us-gaap_DividendsCommonStock 听 听 听 (92.5)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 听 听 听 听 听
Preferred stock dividends ($1.66 per depositary share) (51.2)us-gaap_DividendsPreferredStock 听 听 听 听 听 听 听 听 听 听 听
Preferred Stock Dividends (51.3)clf_PreferredStockDividends 听 听 听 (51.3)clf_PreferredStockDividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		听 听 听 听 听 听 听
Preferred Stock, Shares Outstanding 听 29,300,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		听 听 听 听 听 听 听 听 听 听
Balance, end of period at Dec. 31, 2014 (1,734.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 731.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		19.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		2,309.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember 		(3,960.7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember 		(285.7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember 		(245.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember 		(303.0)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember 		听 听 听 听
Balance, end of period (in shares) at Dec. 31, 2014 153,246,754us-gaap_CommonStockSharesOutstanding 听 153,200,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Balance, beginning of period at Sep. 30, 2014 听 听 听 听 听 听 听 听 听 听 听 听
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] 听 听 听 听 听 听 听 听 听 听 听 听
Preferred stock dividends ($1.66 per depositary share) (12.8)us-gaap_DividendsPreferredStock 听 听 听 听 听 听 听 听 听 听 听
Preferred Stock, Shares Outstanding 听 29,300,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		听 听 听 听 听 听 听 听 听 听
Balance, end of period at Dec. 31, 2014 $ (1,734.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 731.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= clf_DepositarySharesMember 		$ 19.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听
Balance, end of period (in shares) at Dec. 31, 2014 153,246,754us-gaap_CommonStockSharesOutstanding 听 153,200,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		听 听 听 听 听 听 听 听 听