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Stock-Based Compensation - Narrative and Grant Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock-based compensation $ 13.6 $ 8.4 $ 25.0 $ 23.2
2010 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance-based stock options granted (in shares)     1,750  
Weighted-average exercise price (in usd per share)     $ 25.70  
Weighted-average grant-date fair value (in usd per share)     $ 11.48  
2010 Equity Incentive Plan | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units granted (in shares) 266 53 1,500 89
Weighted-average grant-date fair value (in usd per share) $ 38.49 $ 48.63 $ 28.62 $ 55.92
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) 128 627 572 883
Weighted-average grant-date fair value (in usd per share) $ 41.84 $ 49.17 $ 32.18 $ 50.15
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 | Maximum        
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 | Stock options | Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)     3 years  
Term of award (in years)     7 years  
Performance period     5 years