Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Narrative (Details)

v3.21.2
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options, granted (in shares) 0  
Options, outstanding, intrinsic value $ 2.6  
Options, exercisable, intrinsic value 2.6  
Options, exercised, intrinsic value $ 18.9  
Term for outstanding stock 3 years 10 months 24 days  
Term for exercisable stock 3 years 10 months 24 days  
Performance stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 650,774  
Vesting period 3 years  
Actual number of shares that may be issued, percent, minimum 0.00%  
Actual number of shares that may be issued, percent, maximum 200.00%  
Incentive Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation not yet recognized, stock options $ 19.5  
Compensation cost not yet recognized, period for recognition 2 years  
Tax benefit from compensation expense $ 8.4 $ 6.0
Incentive Award Plan | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 851,885  
Restricted stock units, conversion of stock, conversion rights (in shares) 1  
Compensation not yet recognized, stock options $ 8.9  
Compensation cost not yet recognized, period for recognition 2 years  
Employees and Officers | Incentive Award Plan | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Director | Incentive Award Plan | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 1 year