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SHAREHOLDERS' EQUITY Accumulate Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||||
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2013
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| Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | $ (251.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (291.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (204.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (202.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | |
| Accumulated other comprehensive loss | (38.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (245.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (112.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (55.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | |
| Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (0.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (1.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 6.2us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 10.1us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | |
| Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | 232.4us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 64.4us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 106.7us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 147.2us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | |
| Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (18.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (18.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (20.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (10.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | |
| Accumulated Other Comprehensive Income (Loss) [Member] | |||||
| Other Comprehensive Income (Loss), before Reclassifications, before Tax |
12.1us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
41.6us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
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| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
195.5clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
16.2clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
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| Accumulated Defined Benefit Plans Adjustment [Member] | |||||
| Other Comprehensive Income (Loss), before Reclassifications, before Tax |
31.1us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
(0.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Accumulated Net Unrealized Investment Gain (Loss) [Member] | |||||
| Other Comprehensive Income (Loss), before Reclassifications, before Tax |
2.8us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
3.8us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Accumulated Translation Adjustment [Member] | |||||
| Other Comprehensive Income (Loss), before Reclassifications, before Tax |
(14.7)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
40.5us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | |||||
| Other Comprehensive Income (Loss), before Reclassifications, before Tax |
(7.1)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
(2.3)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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| Accumulated Defined Benefit Plans Adjustment [Member] | |||||
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
8.5clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
3.3clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Accumulated Net Unrealized Investment Gain (Loss) [Member] | |||||
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
(2.0)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
0.1clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Accumulated Translation Adjustment [Member] | |||||
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
182.7clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
0clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | |||||
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
$ 6.3clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
$ 12.8clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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- Definition
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) No definition available.
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- Definition
Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax and reclassification adjustments of other comprehensive income (loss). No definition available.
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