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Income Taxes - Allocation of Total Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Tax Benefit/(Loss) Applicable To: [Abstract]    
Loss from continuing operations, before income taxes $ (154.5) $ (290.2)
Discontinued operations 0 2.8
Accumulated other comprehensive loss $ (0.1) $ (1.5)