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Stock-Based Compensation Plans - Summary of Performance Share Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Stock-Based Compensation Plans      
Vested or expected to vest, shares (in shares) 1,501,901    
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 61.06    
Vested or expected to vest, weighted-average remaining contractual life (Year) 3 years 9 months 18 days    
Vested or expected to vest, aggregate intrinsic value $ 91.6    
PSU      
Stock-Based Compensation Plans      
Number of Units Outstanding (in shares), Beginning 988,543 915,233  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 53.81 $ 38.41  
Weighted-Average Remaining Contractual (years) 4 years 7 months 6 days 4 years 6 months 4 years 6 months
Aggregate Intrinsic Value $ 123.1 $ 86.3 $ 67.9
PSUs Granted (in shares) 92,873 95,134  
PSUs Granted, weighted-average granted date fair value (in dollars per share) $ 109.77 $ 105.96  
Performance units issued (in shares) 40,477 68,005  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 80.11 $ 53.80  
Exercised (in shares) (109,820) (87,354)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 19.88 $ 14.29  
Forfeited (in shares) (3,428) (2,475)  
Forfeited, weighted-average granted date fair value (in dollars per share) $ 80.66 $ 81.82  
Number of Units Outstanding (in shares), Ending 1,008,645 988,543 915,233
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 62.92 $ 53.81 $ 38.41
Vested or expected to vest, shares (in shares) 1,008,645    
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 62.92    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 7 months 6 days    
Vested or expected to vest, aggregate intrinsic value $ 123.1    
Exercisable, number of units (in shares) 726,075    
Exercisable, weighted-average granted date fair value (in dollars per share) $ 47.45    
Exercisable, weighted-average remaining contractual (years) 3 years 2 months 12 days    
Exercisable, aggregate intrinsic value $ 88.6