Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Effective tax rate (percent) 31.50% 28.90%
Statutory rate (percent) 35.00% 35.00%
Unrecognized tax benefits, interest and penalties accrued $ 1.2  
Unrecognized tax benefits 12.1  
Unrecognized tax benefits that would decrease the effective tax rate if recognized $ 12.0