根据第13或15(d)条提交的季度报告

商誉及其他无形资产及负债（商誉表）（详情）

v2.4.1.9
商誉及其他无形资产和负债（商誉表）（详情）（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
商誉[向前滚动]    
期初余额 2.0美元us-gaap_Goodwill 74.5美元us-gaap_Goodwill
企业合并产生的 0us-gaap_GoodwillAcquiredDuringPeriod 0us-gaap_GoodwillAcquiredDuringPeriod
障碍 0us-gaap_GoodwillImpairmentLoss (73.5)us-gaap_GoodwillImpairmentLoss
外币折算的影响 0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments 1.0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
期末余额 2.0us-gaap_Goodwill 2.0us-gaap_Goodwill
累计商誉减值损失 (73.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (73.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
皇冠体育官网铁矿石[成员]    
商誉[向前滚动]    
期初余额 2.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		2.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
企业合并产生的 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
障碍 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
外币折算的影响 0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
期末余额 2.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		2.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
累计商誉减值损失 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember 		0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
亚太铁矿石〔成员〕    
商誉[向前滚动]    
期初余额 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		72.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
企业合并产生的 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
障碍 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		(73.5)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
外币折算的影响 0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		1.0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
期末余额 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
累计商誉减值损失 (73.5美元)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember 		(73.5美元)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember