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Income Taxes (Components of Income Tax Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 0 $ 0 $ 0.6
State 0.2 0 0.2
International 27.2 20.6 14.6
Current income tax provision 27.4 20.6 15.4
Deferred:      
Federal and state 3.3 2.7 (0.5)
International 2.0 0.2 (1.3)
Deferred income tax provision 5.3 2.9 (1.8)
Income tax expense $ 32.7 $ 23.5 $ 13.6