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Income Taxes - Allocation of Total Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income tax (benefit)/provision applicable to:      
Loss from continuing operations, before income taxes $ (1,549.7) $ (870.5) $ (534.6)
Discontinued operations 0.2 50.1 27.8
Accumulated other comprehensive income/(loss) 15.9 10.9 70.9
Retained earnings 0 0 6.0
Additional paid in capital $ 14.5 $ (2.1) $ 11.6