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Share-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
RSU Activity  
Outstanding at the beginning of the period (in shares) | shares 750,821
Granted (in shares) | shares 298,338
Vested (in shares) | shares (74,934)
Forfeited (in shares) | shares (10,126)
Outstanding at the end of the period (in shares) | shares 964,099
Weighted-Average Grant-Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 60.88
Granted (in dollars per share) | $ / shares 81.16
Vested (in dollars per share) | $ / shares 60.47
Forfeited (in dollars per share) | $ / shares 62.37
Outstanding at the end of the period (in dollars per share) | $ / shares $ 67.27
Additional disclosures  
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $ $ 32.5
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 9 months 18 days
Total fair value of shares vested during the period | $ $ 4.5
Minimum  
Share-Based Compensation  
Vesting period 2 years
Maximum  
Share-Based Compensation  
Vesting period 4 years
Tranche One  
Share-Based Compensation  
Performance period 3 years
Tranche Two | Minimum  
Share-Based Compensation  
Performance period 1 year
Tranche Two | Maximum  
Share-Based Compensation  
Performance period 2 years