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Stock-Based Compensation Plans - Summary of Performance Share Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jul. 31, 2023
Jan. 31, 2023
Stock-Based Compensation Plans    
Vested or expected to vest, shares (in shares) 1,657,444  
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 51.83  
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 3 months 18 days  
Vested or expected to vest, aggregate intrinsic value $ 41.9  
Performance Shares [Member]    
Stock-Based Compensation Plans    
Number of Units Outstanding (in shares), Beginning 915,233  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 38.41  
Weighted-Average Remaining Contractual (years) 5 years 4 years 6 months
Aggregate Intrinsic Value $ 75.9 $ 67.9
PSUs Granted (in shares) 95,134  
PSUs Granted, weighted-average granted date fair value (in dollars per share) $ 106.36  
Performance units issued (in shares) 68,005  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 54.00  
Exercised (in shares) (84,125)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 11.19  
Forfeited (in shares) (2,475)  
Forfeited, weighted-average granted date fair value (in dollars per share) $ 82.13  
Number of Units Outstanding (in shares), Ending 991,772 915,233
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 54.07 $ 38.41
Vested or expected to vest, shares (in shares) 991,772  
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 54.07  
Vested or expected to vest, weighted-average remaining contractual life (Year) 5 years  
Vested or expected to vest, aggregate intrinsic value $ 75.9  
Exercisable, number of units (in shares) 723,681  
Exercisable, weighted-average granted date fair value (in dollars per share) $ 36.95  
Exercisable, weighted-average remaining contractual (years) 3 years 8 months 12 days  
Exercisable, aggregate intrinsic value $ 55.3