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Stock-Based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Stock-Based Compensation Plans      
Number of Stock Options Outstanding (in shares), Beginning 1,568,551 1,593,433  
Weighted-Average Exercise Price (in dollars per share), Beginning $ 52.31 $ 45.54  
Weighted-Average Remaining Contractual Life (years) 3 years 9 months 18 days 3 years 10 months 24 days 4 years 1 month 6 days
Aggregate Intrinsic Value $ 91.6 $ 54.8 $ 45.7
Granted, shares (in shares) 280,658 278,845 356,014
Granted, weighted-average exercise price (in dollars per share) $ 88.82 $ 79.80  
Exercised, shares (in shares) (332,109) (285,808)  
Exercised, weighted-average exercise price (in dollars per share) $ 37.25 $ 33.06  
Forfeited, shares (in shares) (15,199) (17,919)  
Forfeited, weighted-average exercise price (in dollars per share) $ 77.06 $ 62.30  
Number of Stock Options Outstanding (in shares), Ending 1,501,901 1,568,551 1,593,433
Weighted-Average Exercise Price (in dollars per share), Ending $ 61.06 $ 52.31 $ 45.54
Vested or expected to vest, shares (in shares) 1,501,901    
Vested or expected to vest, weighted-average exercise price (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    
Exercisable, shares (in shares) 1,091,499    
Exercisable, weighted-average exercise price (in dollars per share) $ 54.70    
Exercisable, weighted-average remaining contractual life (Year) 3 years 3 months 18 days    
Exercisable, aggregate intrinsic value $ 73.5