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Share-Based Compensation - Performance shares and performance units activity (Details)
 12 Months Ended
Dec. 31, 2021
$ / shares
shares
Performance Shares  
Unvested Shares:  
Unvested balance, beginning of year (in shares) | shares 1,851,382
Performance shares and units granted | shares 674,406
Share Based Compensation, Performance Adjustment | shares (39,510) [1],[2]
Vested (in shares) | shares (624,518)
Unvested balance, end of year (in shares) | shares 1,861,760
Weighted Average Grant Date Fair Value:  
Unvested balance, beginning of year, weighted average grant date fair value | $ / shares $ 34.42
Weighted average grant date fair value | $ / shares 37.38
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Performance Adjustment, Weighted Average Grant Date Fair Value | $ / shares 24.78 [1],[2]
Vested, weighted average grant date fair value | $ / shares 24.78
Unvested balance, end of year, weighted average grant date fair value | $ / shares $ 38.93
Performance Units  
Unvested Shares:  
Unvested balance, beginning of year (in shares) | shares 32,065
Performance shares and units granted | shares 10,698
Share Based Compensation, Performance Adjustment | shares 11,447 [1],[2]
Vested (in shares) | shares (24,440)
Unvested balance, end of year (in shares) | shares 29,770
Weighted Average Grant Date Fair Value:  
Unvested balance, beginning of year, weighted average grant date fair value | $ / shares $ 33.48
Weighted average grant date fair value | $ / shares 37.38
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Performance Adjustment, Weighted Average Grant Date Fair Value | $ / shares 24.71 [1],[2]
Vested, weighted average grant date fair value | $ / shares 24.71
Unvested balance, end of year, weighted average grant date fair value | $ / shares $ 38.71
[1] The performance adjustment represents the change in PSUs, which vested following the end of the performance period. The performance units were granted at the target level of achievement
[2] The performance adjustment represents the difference between the number of performance shares granted and earned, which vested following the end of the performance period. The performance shares were granted at the maximum level of achievement.