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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, 2024
Jan. 31, 2024
Stock-Based Compensation Plans    
Vested or expected to vest, shares (in shares) 1,622,821  
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 60.37  
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 2 months 12 days  
Vested or expected to vest, aggregate intrinsic value $ 69.2  
PSU    
Stock-Based Compensation Plans    
Number of Units Outstanding (in shares), Beginning 988,543  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 53.81  
Weighted-Average Remaining Contractual (years) 5 years 1 month 6 days 4 years 6 months
Aggregate Intrinsic Value $ 104.9 $ 86.3
PSUs Granted (in shares) 92,873  
PSUs Granted, weighted-average granted date fair value (in dollars per share) $ 110.99  
Performance units issued (in shares) 40,477  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 80.99  
Exercised (in shares) (103,504)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 13.62  
Number of Units Outstanding (in shares), Ending 1,018,389 988,543
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 63.77 $ 53.81
Vested or expected to vest, shares (in shares) 1,018,389  
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 63.77  
Vested or expected to vest, weighted-average remaining contractual life (Year) 5 years 1 month 6 days  
Vested or expected to vest, aggregate intrinsic value $ 104.9  
Exercisable, number of units (in shares) 732,391  
Exercisable, weighted-average granted date fair value (in dollars per share) $ 48.27  
Exercisable, weighted-average remaining contractual (years) 3 years 9 months 18 days  
Exercisable, aggregate intrinsic value $ 75.4