根据第13或15(d)条提交的季度报告

物业、厂房及设备（各主要类别合并应折旧资产的价值）（详情）

v2.4.1.9
财产、厂房和设备（各主要类别合并可折旧资产的价值）（详情）（美元）
除非另有说明，单位为百万
2015年3月31日
2014年12月31日
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 美元1872 .0us-gaap_PropertyPlantAndEquipmentGross 1870美元。2us-gaap_PropertyPlantAndEquipmentGross
累积折旧及损耗，物业，厂房及设备 (824.8)clf_AccumulatedDepreciationandDepletionPropertyPlantandEquipment (799.7)clf_AccumulatedDepreciationandDepletionPropertyPlantandEquipment
物业、厂房及设备、净 1,047.2us-gaap_PropertyPlantAndEquipmentNet 1,070.5us-gaap_PropertyPlantAndEquipmentNet
土地权及矿业权[成员]    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 500.5us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MiningPropertiesAndMineralRightsMember 		500.5us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MiningPropertiesAndMineralRightsMember
办公室及资讯科技〔成员〕    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 69.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember 		73.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
建筑(成员)    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 59.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember 		59.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
采矿设备〔成员〕    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 584.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember 		585.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
加工设备〔成员〕    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 512.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember 		510.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
电力设施〔委员〕    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 44.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember 		46.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ElectricGenerationEquipmentMember
土地改善〔成员〕    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 24.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember 		24.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember
其他(成员)    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 54.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherAssetsMember 		55.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherAssetsMember
工程进行中[委员]    
物业、厂房及设备〔分项〕    
物业、厂房及设备，总值 20.7美元us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember 		14.4美元us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember