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Stock-based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Number of Stock Options Outstanding (in shares) 1,147,720 1,127,822  
Weighted-Average Exercise Price (in dollars per share) $ 33.77 $ 26.82  
Weighted-Average Remaining Contractual Life (Year) 4 years 4 months 24 days 4 years 10 months 24 days 4 years 7 months 6 days
Aggregate Intrinsic Value $ 41.5 $ 28.1 $ 20.2
Granted, shares (in shares) 271,025 381,859 367,173
Granted, weighted-average exercise price (in dollars per share) $ 65.03 $ 41.51  
Exercised, shares (in shares) (90,166) (338,342)  
Exercised, weighted-average exercise price (in dollars per share) $ 29.38 $ 18.43  
Forfeited, shares (in shares) (9,300) (23,619)  
Forfeited, weighted-average exercise price (in dollars per share) $ 53.94 $ 33.88  
Number of Stock Options Outstanding (in shares) 1,319,279 1,147,720 1,127,822
Weighted-Average Exercise Price (in dollars per share) $ 42.35 $ 33.77 $ 26.82
Vested or expected to vest, shares (in shares) 1,319,279    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 42.35    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 4 months 24 days    
Vested or expected to vest, aggregate intrinsic value $ 41.5    
Exercisable, shares (in shares) 856,426    
Exercisable, weighted-average exercise price (in dollars per share) $ 36.91    
Exercisable, weighted-average remaining contractual life (Year) 3 years 10 months 24 days    
Exercisable, aggregate intrinsic value $ 31.6