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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, 2026
Mar. 31, 2025
Earnings per common share:    
Net income attributable to common stockholders $ 136.3 $ 53.2
Weighted average common shares outstanding (in shares) 18,518 19,929
Earnings per common share (in dollars per share) $ 7.36 $ 2.67
Earnings per common share - assuming dilution:    
Net income attributable to common stockholders $ 136.3 $ 53.2
Weighted average common shares outstanding (in shares) 18,518 19,929
Common equivalent shares:    
Dilutive share-based awards (in shares) 190 275
Weighted average common shares outstanding - assuming dilution (in shares) 18,708 20,204
Earnings per common share assuming dilution (in dollars per share) $ 7.28 $ 2.63