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Earnings Per Common Share - Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Numerator    
Net income $ 274.1 $ 146.6
Less: Earnings allocated to participating securities, basic (2.3) (1.4)
Less: Earnings allocated to participating securities, diluted (2.3) (1.4)
Net income used in diluted per common share calculations, basic 271.8 145.2
Net income used in basic per common share calculations, diluted $ 271.8 $ 145.2
Denominator    
Weighted average common shares outstanding used in basic per common share calculations (in shares) 49,702,511 50,799,019
Incremental common shares from:    
Weighted average common shares outstanding used in diluted per common share calculations (in shares) 50,197,547 51,248,716
Basic (in dollars per share) $ 5.47 $ 2.86
Diluted (in dollars per share) $ 5.41 $ 2.83
PSUs    
Incremental common shares from:    
Incremental common shares (in shares) 494,763 449,697
ESPP    
Incremental common shares from:    
Incremental common shares (in shares) 273 0