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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax [Line Items]        
Income tax expense $ 41.5 $ 35.7 $ 80.8 $ 81.1
Effective tax rate 24.80% 23.00% 24.70% 23.90%