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Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details)

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PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Construction in Progress [Member]
Dec. 31, 2012
Construction in Progress [Member]
Property, Plant and Equipment [Line Items] Ìý Ìý Ìý Ìý
Depreciation And Depletion $ 135.9 $ 111.4 Ìý Ìý
Accumulated amount of capitalized interest included within construction in progress Ìý Ìý 24.2 17.1
Interest costs capitalized during the period Ìý Ìý $ 7.1 $ 15.4