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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred provision (benefit) for income taxes                   $ 252.0 $ 44.3
Provision for income taxes 8.8 (3.9) (2.0) (3.1) 244.1 (7.9) 4.2 (7.8) (0.2) 232.6 19.4
Internal Revenue Service (IRS) [Member]
                      
Current provision (benefit) for income taxes                 (2.4) (20.1) (27.8)
Deferred provision (benefit) for income taxes                   236.7 43.3
Domestic Tax Authority [Member]
                      
Current provision (benefit) for income taxes                 2.2 0.6 2.9
Deferred provision (benefit) for income taxes                   15.3 1.0
Foreign Tax Authority [Member]
                      
Current provision (benefit) for income taxes                   0.1  
State and Local Jurisdiction [Member]
                      
Current provision (benefit) for income taxes                 (0.2) (19.4) (24.9)
Deferred provision (benefit) for income taxes                   $ 252.0 $ 44.3