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Earnings Per Share - Schedule of Reconciliation of Basic and Diluted Earnings Per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings per common share:    
Net income attributable to common stockholders $ 53.2 $ 66.0
Weighted average common shares outstanding (in shares) 19,929 20,814
Earnings per common share (in dollars per share) $ 2.67 $ 3.17
Earnings per common share - assuming dilution:    
Net income attributable to common stockholders $ 53.2 $ 66.0
Weighted average common shares outstanding (in shares) 19,929 20,814
Common equivalent shares:    
Dilutive share-based awards (in shares) 275 348
Weighted average common shares outstanding - assuming dilution (in shares) 20,204 21,162
Earnings per common share assuming dilution (in dollars per share) $ 2.63 $ 3.12