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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Tax [Line Items]        
Income tax expense $ 34.4 $ 29.8 $ 124.5 $ 96.1
Effective tax rate 25.40% 23.50% 26.20% 22.90%
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities   $ 14.1