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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock-based compensation $ 6.9 $ 16.8 $ 30.1 $ 37.4
2010 Equity Incentive Plan | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted (in shares) 52 105 140 288
Weighted-average grant-date fair value (in usd per share) $ 35.41 $ 79.71 $ 48.39 $ 71.74
2010 Equity Incentive Plan | Performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted (in shares) 0 0 883 612
Weighted-average grant-date fair value (in usd per share) $ 0 $ 0 $ 50.15 $ 49.04
Award vesting period (in years)     4 years  
2010 Equity Incentive Plan | Performance-based restricted stock units | 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 restricted stock units | Minimum | Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     150.00%  
2010 Equity Incentive Plan | Performance-based restricted stock units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     150.00%  
2010 Equity Incentive Plan | Performance-based restricted stock units | Maximum | Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     200.00%  
2010 Equity Incentive Plan- Executive Employees | Performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period for recognition (in years)     3 years