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累计其他综合收益（亏损）累计其他综合收益（亏损）及相关税收影响（详情）（美元）
除非另有说明，单位为百万
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2014年12月31日
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2014年9月30日
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2014.6.30
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2014年3月31日
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2013年12月31日
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2013年9月30日
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2013年6月30日
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2013年3月31日
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2012年12月31日
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2011年12月31日
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| 累计其他综合收益（损失），税前 |
(388.1美元)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes |
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(213.3美元)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes |
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(244.7美元)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes |
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| 累计其他综合收益（损失）、税收 |
142.3clf_AccumulatedOtherComprehensiveIncomeLossTax |
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100.4clf_AccumulatedOtherComprehensiveIncomeLossTax |
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189.1clf_AccumulatedOtherComprehensiveIncomeLossTax |
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| 累计其他综合损失 |
(245.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(101.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(20.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(55.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(112.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(178.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(239.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(51.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(55.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
(92.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
| 退休后福利及责任〔成员〕 |
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| 累计其他综合收益（损失），税前 |
(425.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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(299.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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(576.7)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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| 累计其他综合收益（损失）、税收 |
134.2clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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94.4clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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194.0clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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| 累计其他综合损失 |
(291.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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(204.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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(382.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_PostretirementBenefitLiabilityMember |
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| 外币折算调整〔成员〕 |
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| 累计其他综合收益（损失），税前 |
64.4clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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106.7clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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316.3clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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| 累计其他综合收益（损失）、税收 |
0clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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0clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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0clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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| 累计其他综合损失 |
64.4us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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106.7us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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316.3us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_ForeignCurrencyTranslationAdjustmentMember |
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| 衍生品未实现利得亏损[成员] |
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| 累计其他综合收益（损失），税前 |
(25.9)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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(30.0)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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12.4clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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| 累计其他综合收益（损失）、税收 |
7.8clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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9.1clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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(3.7)clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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| 累计其他综合损失 |
(18.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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(20.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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8.7us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= clf_UnrealizedGainLossOnDerivativesMember |
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| 累计未实现投资净收益（亏损）[成员] |
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| 累计其他综合收益（损失），税前 |
(1.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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9.3clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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3.3clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| 累计其他综合收益（损失）、税收 |
0.3clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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(3.1)clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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(1.2)clf_AccumulatedOtherComprehensiveIncomeLossTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| 累计其他综合损失 |
(1.0美元)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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6.2美元us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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2.1美元us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ clf_AccumulatedOtherComprehensiveIncomeComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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