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Stock Incentive Plans - Additional Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized share-based compensation expense $ 20.4 $ 18.7 $ 19.0
Cash payments for share-based liabilities     13.3
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock unit vesting period   3 years  
Unrecognized compensation expense $ 26.0    
Unrecognized compensation expense, Weighted average recognition period (in Years) 2 years    
Aggregate fair value of awards vested $ 56.1 $ 38.1 $ 27.3
Vested RSUs paid out, percent payable in shares of common stock     66.67%
Vested RSUs paid out, percent payable in cash     33.33%