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Share-Based Compensation - Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Restricted Stock Units  
RSU Activity  
Outstanding at the beginning of the period (in shares) 873,048
Granted (in shares) 372,271
Vested (in shares) (380,151)
Forfeited (in shares) (15,213)
Outstanding at the end of the period (in shares) 849,955
Weighted-Average Grant-Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 75.22
Granted (in dollars per share) | $ / shares 80.74
Vested (in dollars per share) | $ / shares 77.34
Forfeited (in dollars per share) | $ / shares 77.10
Outstanding at the end of the period (in dollars per share) | $ / shares $ 76.65
Additional disclosures  
Options vested (in shares) 61,863
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $ $ 28.7
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 1 month 2 days
Total fair value of shares vested during the period | $ $ 31.6
Restricted Stock Units | Minimum  
Additional disclosures  
Performance period 12 months
Performance based restricted stock units  
Additional disclosures  
Performance period 3 years
Other Performance based restricted stock units | Minimum  
Additional disclosures  
Performance period 1 year
Other Performance based restricted stock units | Maximum  
Additional disclosures  
Performance period 2 years
Timed based restricted stock units | Minimum  
Additional disclosures  
Performance period 2 years
Timed based restricted stock units | Maximum  
Additional disclosures  
Performance period 4 years
2021, 2022 and 2023 LTI performance-based RSU grants | Restricted Stock Units  
Additional disclosures  
Additional shares authorized 131,839
Vesting period 3 years