根据第13或15(d)条提交的季度报告

金融工具公允价值金融工具公允价值(公允价值计量,非经常性)(详细信息)

v2.4.1.9
金融工具公允价值金融工具公允价值(非经常性公允价值计量)(详细信息)(美元)
除非另有说明,单位为百万
3个月结束 12个月结束
2015年3月31日
2014年12月31日
公允价值、经常性和非经常性计量资产和负债[细目]    
商誉、减值损失 0美元us-gaap_GoodwillImpairmentLoss 73.5美元us-gaap_GoodwillImpairmentLoss
资产,公允价值披露,非经常性 397.2us-gaap_AssetsFairValueDisclosureNonrecurring 79.4us-gaap_AssetsFairValueDisclosureNonrecurring
商誉和其他长期资产的减值 269.5clf_ImpairmentCharges 644.7clf_ImpairmentCharges
公允价值,输入值,第1级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
资产,公允价值披露,非经常性 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
公允价值,输入值,第2级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
资产,公允价值披露,非经常性 397.2us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
公允价值,输入值,第3级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
资产,公允价值披露,非经常性 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
79.4us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
全球勘探投资风险[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
权益法投资,公允价值披露   0us-gaap_EquityMethodInvestmentsFairValueDisclosure
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_GlobalExplorationInvestmentinVentureMember
权益法投资,临时减值除外   9.2us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_GlobalExplorationInvestmentinVentureMember
全球勘探风险投资[成员]|公允价值,投入,第一级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
权益法投资,公允价值披露   0us-gaap_EquityMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_GlobalExplorationInvestmentinVentureMember
全球勘探风险投资[成员]|公允价值,投入,第2级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
权益法投资,公允价值披露   0us-gaap_EquityMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_GlobalExplorationInvestmentinVentureMember
全球勘探风险投资[成员]|公允价值,投入,第3级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
权益法投资,公允价值披露   0us-gaap_EquityMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_GlobalExplorationInvestmentinVentureMember
亚太铁矿石〔成员〕    
公允价值、经常性和非经常性计量资产和负债[细目]    
商誉,公允价值披露   0us-gaap_GoodwillFairValueDisclosure
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
商誉、减值损失   73.5us-gaap_GoodwillImpairmentLoss
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
亚太地区铁矿石[成员]|公允价值,投入,第一级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
商誉,公允价值披露   0us-gaap_GoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
亚太地区铁矿石[成员]|公允价值,投入,第2级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
商誉,公允价值披露   0us-gaap_GoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
亚太地区铁矿石[成员]|公允价值,投入,第3级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
商誉,公允价值披露   0us-gaap_GoodwillFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
其他报告单位〔成员〕    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ clf_ReportingUnitAxis
= clf_OtherReportingUnitsMember
有形资产减值费用   11.3us-gaap_TangibleAssetImpairmentCharges
/ clf_ReportingUnitAxis
= clf_OtherReportingUnitsMember
其他报告单位[成员]|公允价值,输入值,第1级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ clf_ReportingUnitAxis
= clf_OtherReportingUnitsMember
其他报告单位[成员]|公允价值,输入值,第2级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ clf_ReportingUnitAxis
= clf_OtherReportingUnitsMember
其他报告单位[成员]|公允价值,输入值,第3级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ clf_ReportingUnitAxis
= clf_OtherReportingUnitsMember
亚太地区[成员]|亚太地区铁矿石[成员]|公允价值,投入,第2级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ clf_AssetgroupAxis
= us-gaap_AsiaPacificMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
有限寿命无形资产,公允价值披露   0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ clf_AssetgroupAxis
= us-gaap_AsiaPacificMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
亚太铁矿石[成员]|亚太铁矿石[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   72.4us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
有形资产减值费用   526.5us-gaap_TangibleAssetImpairmentCharges
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
其他资产减值费用   24.2us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
有限寿命无形资产,公允价值披露   7.0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
亚太地区铁矿石[成员]|00亚太地区铁矿石[成员]|公允价值,投入,第一级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
有限寿命无形资产,公允价值披露   0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
亚太地区铁矿石[成员]|0亚太地区铁矿石[成员]|公允价值,投入,第3级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
财产、厂房和设备,公允价值披露   72.4us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
有限寿命无形资产,公允价值披露   7.0us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ clf_AssetgroupAxis
= clf_AsiaPacificIronOreMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ clf_ReportingUnitAxis
= clf_AsiaPacificIronOreMember
五亿四千四百万七亿七千二百二十二张留置权票[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
债务工具,公允价值披露 397.2us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
 
新发行债券的收益 269.5clf_Gainonnewdebtissued
/ us-gaap_DebtInstrumentAxis
= clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
 
五亿四千四百万柒点七十五第二十二秒留置权票据[成员]|公允价值,输入,第一级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
债务工具,公允价值披露 0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
五亿四千四百万柒点柒点二十二秒留置权票据[成员]|公允价值,输入,第二级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
债务工具,公允价值披露 397.2us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
五亿四千四百万七亿七千二百二十二张留置权票据[成员]|公允价值,输入,第3级[成员]    
公允价值、经常性和非经常性计量资产和负债[细目]    
债务工具,公允价值披露 0美元us-gaap_DebtInstrumentFairValue
/ us-gaap_DebtInstrumentAxis
= clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member