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Income Taxes (Income Taxes by Jurisdiction) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred provision (benefit) for income taxes                 $ 301.6 $ 44.3 $ (1.6)
Provision for income taxes 293.7 (7.9) 4.2 (7.8) 5.2 1.9 6.9 5.4 282.2 19.4 35.7
Domestic Country [Member]
                      
Current provision (benefit) for income taxes                 (20.1) (27.8) 30.4
Deferred provision (benefit) for income taxes                 283.3 43.3 (2.1)
Foreign Country [Member]
                      
Current provision (benefit) for income taxes                 0.1    
State and Local Jurisdiction [Member]
                      
Current provision (benefit) for income taxes                 0.6 2.9 6.9
Deferred provision (benefit) for income taxes                 $ 18.3 $ 1.0 $ 0.5