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Income Taxes - Components of income tax provision (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current provision [Abstract]      
Federal $ 48.6 $ 49.9 $ 76.9
State 7.3 7.8 12.0
Foreign 42.3 26.3 28.4
Total current 98.2 84.0 117.3
Deferred provision [Abstract]      
Federal (47.0) 37.1 (1.4)
State 0.4 4.2 (0.2)
Foreign (2.5) (2.9) (6.9)
Total deferred (49.1) 38.4 (8.5)
Total income tax provision $ 49.1 $ 122.4 $ 108.8