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Income Taxes Income tax rate breakdown (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
Income Tax Disclosure [Abstract]                      
U.S. federal                 $ 1.3 $ 12.6 $ (2.9)
State and local                 1.2 0.6 (1.3)
Foreign                 3.3 0.9 (8.6)
Net current tax provision (benefit)                 5.8 14.1 (12.8)
U.S federal                 44.6 (7.3) (39.7)
State and local                 2.5 0 (6.1)
Foreign                 13.4 (0.3) (11.4)
Net valuation allowance increase (decrease)                 (25.2) 0.5 28.9
Deferred income tax expense (benefit)                 35.3 (7.1) (28.3)
Provision (benefit) for income taxes $ (10.5) $ 4.4 $ 24.3 $ 22.9 $ 12.6 $ 7.7 $ (11.6) $ (1.6) $ 41.1 $ 7.0 $ (41.1)