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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, 2025
Jan. 31, 2025
Stock-Based Compensation Plans    
Vested or expected to vest, shares (in shares) 1,617,804  
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 71.73  
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 $ 53.4  
PSU    
Stock-Based Compensation Plans    
Number of Units Outstanding (in shares), Beginning 1,008,645  
Weighted-Average Granted Date Fair Value (in dollars per share), Beginning $ 62.92  
Weighted-Average Remaining Contractual (years) 4 years 10 months 24 days 4 years 7 months 6 days
Aggregate Intrinsic Value $ 106.0 $ 123.1
PSUs Granted (in shares) 103,558  
PSUs Granted, weighted-average granted date fair value (in dollars per share) $ 120.7  
Performance units issued (in shares) 58,628  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 60.81  
Exercised (in shares) (121,829)  
Exercised, weighted-average granted date fair value (in dollars per share) $ 39.64  
Forfeited (in shares) (36,734)  
Forfeited, weighted-average granted date fair value (in dollars per share) $ 111.17  
Number of Units Outstanding (in shares), Ending 1,012,268 1,008,645
Weighted-Average Granted Date Fair Value (in dollars per share), Ending $ 69.33 $ 62.92
Vested or expected to vest, shares (in shares) 1,012,268  
Vested or expected to vest, weighted-average granted date fair value (in dollars per share) $ 69.32  
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 10 months 24 days  
Vested or expected to vest, aggregate intrinsic value $ 106.0  
Exercisable, number of units (in shares) 758,984  
Exercisable, weighted-average granted date fair value (in dollars per share) $ 51.52  
Exercisable, weighted-average remaining contractual (years) 3 years 8 months 12 days  
Exercisable, aggregate intrinsic value $ 79.5