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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share Reconciliation [Abstract]      
Net income $ 93.7 $ 159.2 $ 245.8
Unvested restricted share participation (0.3) (0.6) (1.0)
Net income per common share – basic $ 93.4 $ 158.6 $ 244.8
Net income - basic (shares) 48.6 48.5 48.2
Net income - basic (EPS) $ 1.92 $ 3.27 $ 5.08
Effect of dilutive securities:      
Nonparticipating unvested restricted shares $ 0.0 $ 0.0 $ 0.0
Nonparticipating unvested restricted shares (shares) 0.2 0.2 0.3
Net income per common share – diluted $ 93.4 $ 158.6 $ 244.8
Net income - diluted (shares) 48.8 48.7 48.5
Net income - diluted (EPS) $ 1.91 $ 3.26 $ 5.05