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SEGMENT REPORTING SEGMENTS REPORTING (Revenue by Geographical Location) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,284.7 us-gaap_Revenues | $ 1,298.2 us-gaap_Revenues | $ 1,100.8 us-gaap_Revenues | $ 940.0 us-gaap_Revenues | $ 1,515.8 us-gaap_Revenues | $ 1,546.6 us-gaap_Revenues | $ 1,488.5 us-gaap_Revenues | $ 1,140.5 us-gaap_Revenues | $ 4,623.7 us-gaap_Revenues | $ 5,691.4 us-gaap_Revenues | $ 5,872.7 us-gaap_Revenues
PROPERTY, PLANT AND EQUIPMENT, NET | 1,414.9 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 11,153.4 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 1,414.9 us-gaap_PropertyPlantAndEquipmentNet | 11,153.4 us-gaap_PropertyPlantAndEquipmentNet | 11,207.3 us-gaap_PropertyPlantAndEquipmentNet
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,139.4 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 1,857.6 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 2,108.5 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
PROPERTY, PLANT AND EQUIPMENT, NET | 1,093.7 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 2,721.6 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 1,093.7 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 2,721.6 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 2,795.3 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
AUSTRALIA |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 72.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU |  |  |  | 751.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU |  |  |  | 72.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | 751.0 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | 1,042.4 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU
China [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,049.0 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN | 1,909.4 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN | 2,008.2 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 439.1 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | 871.2 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA | 728.1 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA
PROPERTY, PLANT AND EQUIPMENT, NET | 248.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA |  |  |  | 7,680.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA |  |  |  | 248.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA | 7,680.8 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA | 7,369.6 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 996.2 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = clf_OtherCountriesMember | $ 1,053.2 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = clf_OtherCountriesMember | $ 1,027.9 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = clf_OtherCountriesMember

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