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Stock-Based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2021
Stock-Based Compensation Plans      
Weighted-Average Exercise Price (in dollars per share), Beginning $ 42.35 $ 33.77  
Number of Stock Options Outstanding (in shares), Beginning 1,319,279 1,147,720  
Weighted-Average Remaining Contractual Life (Year) 4 years 1 month 6 days 4 years 4 months 24 days 4 years 10 months 24 days
Aggregate Intrinsic Value $ 45.7 $ 41.5 $ 28.1
Granted, shares (in shares) 356,014 271,025 381,859
Granted, weighted-average exercise price (in dollars per share) $ 61.09 $ 65.03  
Exercised, shares (in shares) (63,890) (90,166)  
Exercised, weighted-average exercise price (in dollars per share) $ 27.34 $ 29.38  
Forfeited, shares (in shares) (17,970) (9,300)  
Forfeited, weighted-average exercise price (in dollars per share) $ 52.98 $ 53.94  
Number of Stock Options Outstanding (in shares), Ending 1,593,433 1,319,279 1,147,720
Weighted-Average Exercise Price (in dollars per share), Ending $ 45.54 $ 42.35 $ 33.77
Vested or expected to vest, shares (in shares) 1,593,433    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 45.54    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 1 month 6 days    
Vested or expected to vest, aggregate intrinsic value $ 45.7    
Exercisable, shares (in shares) 1,104,612    
Exercisable, weighted-average exercise price (in dollars per share) $ 40.35    
Exercisable, weighted-average remaining contractual life (Year) 3 years 6 months    
Exercisable, aggregate intrinsic value $ 37.4