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Employee Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock-based compensation $ 16.8 $ 11.0 $ 37.4 $ 27.4
2010 Equity Incentive Plan | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units granted (in shares) 105 106 288 301
Weighted-average grant-date fair value (in usd per share) $ 79.71 $ 47.19 $ 71.74 $ 36.86
2010 Equity Incentive Plan | Performance based shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant-date fair value (in usd per share) $ 0.00 $ 46.28 $ 49.04 $ 36.02
Award vesting period (in years)     4 years  
Performance based restricted stock units granted (in shares) 0 1 612 616
2010 Equity Incentive Plan | Performance based shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     0.00%  
2010 Equity Incentive Plan | Performance based shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     150.00%  
2010 Equity Incentive Plan- Executive Employees | Performance based shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period for recognition (in years)     3 years