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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share Reconciliation [Abstract]      
Net income $ 208.4 $ 93.7 $ 159.2
Unvested restricted share participation (0.4) (0.3) (0.6)
Net income per common share – basic $ 208.0 $ 93.4 $ 158.6
Net income - basic (shares) 48.9 48.6 48.5
Net income - basic (EPS) $ 4.25 $ 1.92 $ 3.27
Effect of dilutive securities:      
Nonparticipating unvested restricted shares $ 0.0 $ 0.0 $ 0.0
Nonparticipating unvested restricted shares (shares) 0.1 0.2 0.2
Net income per common share – diluted $ 208.0 $ 93.4 $ 158.6
Net income - diluted (shares) 49.0 48.8 48.7
Net income - diluted (EPS) $ 4.24 $ 1.91 $ 3.26