Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Restricted Stock Units and Restricted Stock Awards) (Details)

v3.22.0.1
Stock-Based Compensation (Restricted Stock Units and Restricted Stock Awards) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Stock-based compensation expense     $ 4.3
Fair value adjustment gain on settlement   $ 2.5  
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting period (in years) 3 years    
Unrecognized compensation expense related to shares $ 10.4    
Unrecognized compensation expense weighted-average recognition period 1 year 10 months 24 days    
Number of Shares      
Balance at the beginning of the period (in shares) 302,797 254,118 124,320
Granted (in shares) 129,865 81,689 202,168
Vested (in shares) (62,524) 0 (68,334)
Forfeited (in shares) (10,954) (33,010) (4,036)
Balance at the end of the period (in shares) 359,184 302,797 254,118
Weighted-Average Grant Date Fair Value per Share      
Balance at the beginning of the period (in dollars per share) $ 72.50 $ 67.96 $ 44.64
Granted (in dollars per share) 70.92 83.47 69.68
Vested (in dollars per share) 61.53 0 31.03
Forfeited (in dollars per share) 78.97 64.70 61.27
Balance at the end of the period (in dollars per share) $ 73.64 $ 72.50 $ 67.96
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Unrecognized compensation expense related to shares $ 83.8    
Unrecognized compensation expense weighted-average recognition period 2 years    
Number of Shares      
Balance at the beginning of the period (in shares) 1,345,347 1,318,870 1,461,468
Granted (in shares) 1,195,313 970,390 997,971
Vested (in shares) (828,942) (804,982) (1,029,790)
Forfeited (in shares) (204,294) (138,931) (110,779)
Balance at the end of the period (in shares) 1,507,424 1,345,347 1,318,870
Weighted-Average Grant Date Fair Value per Share      
Balance at the beginning of the period (in dollars per share) $ 70.56 $ 58.88 $ 46.59
Granted (in dollars per share) 71.03 74.61 61.91
Vested (in dollars per share) 69.50 57.77 45.11
Forfeited (in dollars per share) 70.71 62.14 53.16
Balance at the end of the period (in dollars per share) $ 71.50 $ 70.56 $ 58.88
Restricted Stock Units | Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting percent (as a percent) 33.333%    
Restricted Stock Units | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting percent (as a percent) 33.333%    
Restricted Stock Units | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting percent (as a percent) 33.333%    
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Number of shares to be vest upon each evaluation date (as a percent) 0.00%    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Number of shares to be vest upon each evaluation date (as a percent) 150.00%