根据第13和15(d)条提交的年度报告

环境和关闭矿井义务（关闭矿井义务摘要）（详情）

v2.4.1.9
环境和矿山关闭义务（矿山关闭义务摘要）（详细信息）（美元）
除非另有说明，单位为百万
2014年12月31日
2013年12月31日
或有损失〔分项〕    
环境 5.5美元us-gaap_AccrualForEnvironmentalLossContingencies 8.4美元us-gaap_AccrualForEnvironmentalLossContingencies
矿山复垦和结算负债，流动和非流动 255.7clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent 312.6clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
环境和矿山关闭的全部义务 261.2clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent 321.0clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent
小电流部分 5.2clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrent 11.3clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrent
长期的环境和矿山关闭义务 256.0clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityNoncurrent 309.7clf_EnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityNoncurrent
皇冠体育官网铁矿石[成员]bbb100拥有或经营的设施[成员]    
或有损失〔分项〕    
矿山复垦和结算负债，流动和非流动 120.9clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		152.2clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
加拿大东部铁矿石[成员]|自有或营运设施[成员]    
或有损失〔分项〕    
矿山复垦和结算负债，流动和非流动 56.5clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_EasternCanadianIronOreMember 		78.2clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_EasternCanadianIronOreMember
亚太地区铁矿石[成员]|自有或营运设施[成员]    
或有损失〔分项〕    
矿山复垦和结算负债，流动和非流动 21.5clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		25.5clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
北美煤炭[成员]|自有或营运设施[成员]    
或有损失〔分项〕    
矿山复垦和结算负债，流动和非流动 33.9clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_NorthAmericanCoalMember 		34.7clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_OwnedOrOperatingFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= clf_NorthAmericanCoalMember
LTV钢铁矿业公司[成员]|以前拥有或经营的设施[成员]    
或有损失〔分项〕    
矿山复垦和结算负债，流动和非流动 22.9美元clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_PreviouslyOwnedOrOperatingFacilitiesMember
/ clf_MineClosureAxis
= clf_LTVSteelMiningCompanyMember 		22.0美元clf_MineReclamationAndClosingLiabilityCurrentAndNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= clf_PreviouslyOwnedOrOperatingFacilitiesMember
/ clf_MineClosureAxis
= clf_LTVSteelMiningCompanyMember