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已终止业务（详情）（美元）
除非另有说明，单位为百万
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3个月结束 |
12个月结束 |
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2014年12月31日
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2014年9月30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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2014年12月31日
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2013年12月31日
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2012年12月31日
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2012年7月10日
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| 各处置集团损益表、资产负债表和其他披露，包括已终止业务[项目] |
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| CLCC资产出售价格 |
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174.0美元clf_SalePriceofCLCCAssets |
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| 皇冠体育斯洛根县煤炭公司的销售收入 |
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155.0clf_ProceedsfromsaleofCliffsLoganCountyCoal |
0clf_ProceedsfromsaleofCliffsLoganCountyCoal |
0clf_ProceedsfromsaleofCliffsLoganCountyCoal |
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| 综合经营报表 |
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| 停止经营所得及销售利得，税后净额 |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
2.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
2.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
35.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
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| 索诺玛(成员) |
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| 综合经营报表 |
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| 处置组，包括已终止经营，收入 |
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0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
151.6us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
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| 停止经营所得及销售利得，税后净额 |
0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
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0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
2.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
35.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember |
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| 索诺玛[成员]|亚太煤炭[成员] |
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| 各处置集团损益表、资产负债表和其他披露，包括已终止业务[项目] |
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| 所有权权益比例 |
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45.00%clf_PercentageOfOwnershipInterests
/ clf_InvesteeNameAxis
= clf_SonomaMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificCoalMember |
| 已终止经营的收入（损失）[成员]| Sonoma[成员] |
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| 综合经营报表 |
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| 终止经营，处置终止经营的损益，税后净额 |
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0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedOperationsMember |
0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedOperationsMember |
38.0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedOperationsMember |
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| 已终止经营，税务（费用）计提处置（利得）损失的收益 |
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8.1us-gaap_DiscontinuedOperationTaxExpenseBenefitFromProvisionForGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedOperationsMember |
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| 停止经营所得及销售利得，税后净额 |
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(2.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedOperationsMember |
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| 已终止经营，已终止经营的税收影响 |
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2.4美元us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedOperationsMember |
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| Wabush(成员) |
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| 综合经营报表 |
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| 综合收入的百分比 |
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8.00%clf_PercentageofConsolidatedRevenues
/ clf_ReportingUnitAxis
= clf_WabushMember |
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| 合并资产占比 |
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4.00%clf_PercentageofConsolidatedAssets
/ clf_ReportingUnitAxis
= clf_WabushMember |
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| 闭环化油器控制(成员) |
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| 综合经营报表 |
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| 综合收入的百分比 |
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5.00%clf_PercentageofConsolidatedRevenues
/ clf_ReportingUnitAxis
= clf_ClccMember |
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| 合并资产占比 |
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8.00%clf_PercentageofConsolidatedAssets
/ clf_ReportingUnitAxis
= clf_ClccMember |
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| 煤炭收入〔成员〕 |
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| 综合经营报表 |
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| 综合收入的百分比 |
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15.00%clf_PercentageofConsolidatedRevenues
/ clf_RevenueTypeAxis
= clf_CoalRevenueMember |
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