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Income Taxes Income Taxes (Taxes by Jurisdiction) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Income Tax Expense (Benefit)                 $ (1.8) $ (0.9) $ (20.6)
Deferred income taxes                 (84.7) (0.1) 252.4
Provision (benefit) for income taxes (28.7) (18.5) (36.3) (3.0) 8.0 (3.6) (2.1) (3.3) (86.5) (1.0) 231.8
Domestic Tax Authority [Member]
                      
Current Income Tax Expense (Benefit)                 0 (2.9) (21.2)
Deferred income taxes                 (83.0) (0.2) 237.2
State and Local Jurisdiction [Member]
                      
Current Income Tax Expense (Benefit)                 (1.8) 2.0 0.6
Deferred income taxes                 (1.7) 0.1 15.2
Foreign Tax Authority [Member]
                      
Current Income Tax Expense (Benefit)                 0 0 0
Deferred income taxes                 $ 0 $ 0 $ 0