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Compensation Plans - Stock-Based Compensation Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-Based Payment Arrangement, Additional Disclosure          
Stock-based compensation expense   $ 121,800,000 $ 101,900,000 $ 92,300,000  
Forfeitures   1,800,000 2,600,000 1,900,000  
Tax benefit related to stock-based compensation expense   $ 23,500,000 $ 16,400,000 $ 17,900,000  
Options Outstanding          
Beginning Balance (in shares) 105,767        
Ending Balance (in shares)   105,767      
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures          
Common shares repurchased from employees related to employment tax obligations (in shares)   318,801 346,972 494,555  
Forecast          
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures          
Common shares repurchased from employees related to employment tax obligations (in shares) 100,000        
Restricted stock          
Unvested Restricted Stock or Stock Units          
Beginning Balance (in shares) 862,636 1,740,128 2,593,922 4,219,826  
Granted (in shares)   194,572 311,014 336,093  
Vested (in shares)   (1,059,929) (1,128,342) (1,932,950)  
Canceled (in shares)   (12,135) (36,466) (29,047)  
Ending Balance (in shares)   862,636 1,740,128 2,593,922 4,219,826
Weighted Average Grant Date Fair Value (in dollars per share)          
Beginning Balance (in dollars per share) $ 190.79 $ 128.01 $ 104.89 $ 92.43  
Granted (in dollars per share)   310.86 217.55 153.89  
Vested (in dollars per share)   109.51 99.15 85.62  
Canceled (in dollars per share)   213.25 139.97 144.34  
Ending Balance (in dollars per share)   $ 190.79 $ 128.01 $ 104.89 $ 92.43
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 116,100,000 $ 111,900,000 $ 165,500,000  
Restricted stock units          
Unvested Restricted Stock or Stock Units          
Beginning Balance (in shares) 113,685 152,318 181,193 188,328  
Granted (in shares)   31,060 33,694 48,931  
Vested (in shares)   (69,693) (62,569) (56,066)  
Canceled (in shares)   0 0 0  
Ending Balance (in shares)   113,685 152,318 181,193 188,328
Weighted Average Grant Date Fair Value (in dollars per share)          
Beginning Balance (in dollars per share) $ 217.19 $ 169.34 $ 141.08 $ 115.16  
Granted (in dollars per share)   298.65 199.39 177.75  
Vested (in dollars per share)   148.90 103.69 86.01  
Canceled (in dollars per share)   0 0 0  
Ending Balance (in dollars per share)   $ 217.19 $ 169.34 $ 141.08 $ 115.16
Restricted stock and restricted stock units (RSUs)          
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures          
Unrecognized compensation cost related to equity awards   $ 55,400,000      
Weighted average period over which equity award expense expected to be recognized   2 years 7 months 6 days      
Stock options          
Options Outstanding          
Beginning Balance (in shares) 105,767 148,667 156,667 81,667  
Granted (in shares)   0 0 75,000  
Exercised (in shares)   (42,900) (8,000) 0  
Canceled (in shares)   0 0 0  
Expired (in shares)   0 0 0  
Ending Balance (in shares)   105,767 148,667 156,667 81,667
Weighted Average Exercise Price (in dollars per share)          
Beginning Balance (in dollars per share) $ 149.89 $ 135.20 $ 133.35 $ 99.00  
Granted (in dollars per share)   0 0 170.76  
Exercised (in dollars per share)   99.00 99.00 0  
Cancelled (in dollars per share)   0 0 0  
Expired (in dollars per share)   0 0 0  
Ending Balance (in dollars per share)   $ 149.89 $ 135.20 $ 133.35 $ 99.00
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional General Disclosures          
Weighted Average Remaining Contractual Term of Stock Options Outstanding (in Years)   5 years 8 months 12 days 5 years 8 months 12 days 6 years 6 months 5 years 1 month 6 days
Aggregate Intrinsic Value of Stock Options Outstanding   $ 20,077,175 $ 24,492,634 $ 6,504,325 $ 2,547,194
Aggregate Intrinsic Value of Stock Options Exercised   $ 9,341,557 $ 1,334,949    
Number of Exercisable Options (in shares)   30,767 73,667 81,667  
Weighted Average Exercise Price of Options Exercisable   $ 99.00 $ 99.00 $ 99.00  
Weighted Average Remaining Contractual Term for Options Exercisable   2 years 1 month 6 days 3 years 1 month 6 days 4 years 1 month 6 days  
Aggregate Intrinsic Value of Options Exercisable   $ 7,405,925 $ 14,803,384 $ 6,196,075  
Unrecognized compensation cost related to equity awards   $ 1,500,000      
Weighted average period over which equity award expense expected to be recognized   2 years 1 month 6 days      
Tax Benefit Recorded As a Result of Stock Option Exercises   $ 0