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Income Taxes - Deferred Tax Assets and Liabilities as Presented in Consolidated Balance Sheets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Deferred income taxes (current) $ 8.7 $ 114.9
Deferred income taxes (current) 289.2 0
Liabilities held for sale (non-current) 0 51.9
Deferred income taxes (non-current) 2,476.0 4,334.1
Net deferred tax liability $ 2,756.5 $ 4,271.1