Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Income Taxes for Other than Continuing Operations) (Details)

betfred games-free to play_-Topic 220 -SubTopic 10 v2.4.1.9
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12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]      
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax $ 39.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 100.0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 13.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other Comprehensive Income Unrealized Gain Loss On Mark To Market Adjustments Arising During Period Tax 3.6clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax 2.0clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax 1.7clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax
Other Comprehensive Income (Loss), Other Tax (1.1)clf_OtherComprehensiveIncomeLossOtherTax (12.4)clf_OtherComprehensiveIncomeLossOtherTax 2.6clf_OtherComprehensiveIncomeLossOtherTax
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 42.3us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 89.6us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 18.1us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Income Tax Effects Allocated Directly To Equity, Equity Transactions, Acquisition of Noncontrolling Interest 0clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest 102.1clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest 0clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest
Income Tax Effects Allocated Directly to Equity, Equity Transactions (4.8)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions 3.5us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions (12.8)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions
Income Tax Refunds, Discontinued Operations $ 0us-gaap_IncomeTaxRefundsDiscontinuedOperations $ (2.0)us-gaap_IncomeTaxRefundsDiscontinuedOperations $ 10.4us-gaap_IncomeTaxRefundsDiscontinuedOperations