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PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Property, Plant and Equipment [Line Items] | |||
| Depletion | $ 206.5 | $ 209.8 | $ 159.7 |
| Depreciation | 366.9 | 293.5 | 237.8 |
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Construction in Progress [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Accumulated amount of capitalized interest included within construction in progress | 31.4 | 17.1 | |
| Interest costs capitalized during the period | 17.4 | 15.4 | |
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Wabush [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Impairment of Long-Lived Assets Held-for-use | $ 140.1 | $ 49.9 | |
| X | ||||||||||
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- Definition
Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis. No definition available.
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| X | ||||||||||
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- Definition
The noncash expense charged against earnings to recognize the consumption of natural resources. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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