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Stock-based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 4.2 $ 6.1 $ 7.8 $ 11.2  
Stock based compensation tax benefit 0.9 $ 1.3 1.2 $ 1.5  
Excess tax benefit     0.5    
Unrecognized compensation cost $ 0.3   0.3    
Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from stock options exercised     $ 14.1    
Period for recognition of compensation not yet recognized     8 months 12 days    
Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock or performance stock awards outstanding (in shares) 0   0    
Restricted Stock and Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period for recognition of compensation not yet recognized     1 year 8 months 12 days    
Restricted stock or performance stock awards outstanding (in shares) 1,100,000   1,100,000   1,000,000.0
Tax benefit realized on the vesting of restricted stock     $ 0.1    
Compensation not yet recognized, share-based awards other than options $ 19.1   $ 19.1    
Performance Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock or performance stock awards outstanding (in shares) 0   0    
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period for recognition of compensation not yet recognized     2 years 4 months 24 days    
Restricted stock or performance stock awards outstanding (in shares) 700,000   700,000   500,000
Compensation not yet recognized, share-based awards other than options $ 12.4   $ 12.4    
Performance stock awards expected to vest (in shares) 500,000   500,000    
Weighted average fair value per share of performance stock awards expected to vest (in usd per share) $ 29.89   $ 29.89