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Discontinued Operations and Assets Held for Sale - Narrative (Details) (Segment, Discontinued Operations [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Segment, Discontinued Operations [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from Divestiture of Businesses $ 2.2 $ 36.4
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax   10.3
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset $ 2.5