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Earnings Per Common Share - Computation of basic and diluted earnings per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share Reconciliation [Abstract]    
Net income $ 23.6 $ 39.2
Unvested restricted share participation (0.1) (0.1)
Net income per common share – basic $ 23.5 $ 39.1
Net income - basic (shares) 48.7 48.5
Net income - basic (EPS) $ 0.48 $ 0.81
Effect of dilutive securities:    
Nonparticipating unvested restricted shares $ 0.0 $ 0.0
Nonparticipating unvested restricted shares (shares) 0.5 0.4
Net income per common share – diluted $ 23.5 $ 39.1
Net income - diluted (shares) 49.2 48.9
Net income - diluted (EPS) $ 0.48 $ 0.80
Total weighted average restricted shares and antidilutive stock options 1.2 1.2