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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, 2024
Jan. 31, 2023
Jan. 31, 2022
Stock-Based Compensation Plans      
Vested or expected to vest, shares (in shares) 1,568,551    
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 52.31    
Vested or expected to vest, weighted-average remaining contractual life (Year) 3 years 10 months 24 days    
Vested or expected to vest, aggregate intrinsic value $ 54.8    
PSU      
Stock-Based Compensation Plans      
Number of Units Outstanding (in shares), Beginning 915,233 777,538  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 38.41 $ 35.76  
Weighted-Average Remaining Contractual (years) 4 years 6 months 4 years 6 months 4 years 9 months 18 days
Aggregate Intrinsic Value $ 86.3 $ 67.9 $ 57.4
PSUs Granted (in shares) 95,134 97,991  
PSUs Granted, weighted-average granted date fair value (in dollars per share) $ 105.96 $ 64.98  
Performance units issued (in shares) 68,005 39,704  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 53.80 $ 54.34  
Exercised (in shares) (87,354)    
Exercised, weighted-average granted date fair value (in dollars per share) $ 14.29    
Forfeited (in shares) (2,475)    
Forfeited, weighted-average granted date fair value (in dollars per share) $ 81.82    
Number of Units Outstanding (in shares), Ending 988,543 915,233 777,538
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 53.81 $ 38.41 $ 35.76
Vested or expected to vest, shares (in shares) 988,543    
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 53.81    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 6 months    
Vested or expected to vest, aggregate intrinsic value $ 86.3    
Exercisable, number of units (in shares) 720,452    
Exercisable, weighted-average granted date fair value (in dollars per share) $ 36.60    
Exercisable, weighted-average remaining contractual (years) 3 years 2 months 12 days    
Exercisable, aggregate intrinsic value $ 62.8