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Share-Based Compensation - Stock Options Activity (Details) - Stock options expense - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Shares    
Beginning balance (in shares) 983,267  
Granted (in shares) 192,065  
Exercised (in shares) (64,168)  
Forfeited (in shares) (14,482)  
Ending balance (in shares) 1,096,682 983,267
Vested and expected to vest (in shares) 1,053,090  
Exercisable (in shares) 605,708  
Weighted Average Price    
Beginning balance (in dollars per share) $ 178.86  
Granted (in dollars per share) 234.91  
Exercised (in dollars per share) 154.88  
Forfeited (in dollars per share) 185.34  
Ending balance (in dollars per share) 190.00 $ 178.86
Vested and expected to vest (in dollars per share) 188.59  
Exercisable (in dollars per share) $ 166.99  
Weighted-Average Remaining Contractual Term    
Stock options outstanding, weighted-average remaining contractual term 7 years 3 months 10 days 6 years 10 months 17 days
Weighted-average remaining contractual term, vested and expected to vest 7 years 2 months 12 days  
Weighted-average remaining contractual term, exercisable 5 years 10 months 28 days  
Aggregate Intrinsic Value    
Stock options outstanding, aggregate intrinsic value $ 59.2 $ 39.3
Aggregate intrinsic value, vested and expected to vest 58.4  
Aggregate intrinsic value, exercisable $ 46.7