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Income Taxes (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Country
Jun. 30, 2014
Jun. 30, 2015
USD ($)
Country
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
USD ($)
Income Tax Disclosure [Abstract]            
Effective income tax rate (in hundredths) 38.30% 38.80% 39.60% 39.50%    
U.S. Federal statutory rate (in hundredths) 35.00%   35.00%      
Gross unrecognized tax benefits, including interest and penalties $ 32.2   $ 32.2     $ 30.8
Related tax benefits 1.4   1.4     1.4
Net unrecognized tax benefits $ 30.8   $ 30.8     $ 29.4
Number of countries and territories in which the Company operates | Country 80   80      
Forecast [Member]            
Income Tax [Line Items]            
Expected annual effective income tax rate         38.00%