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

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