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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share Reconciliation [Abstract]        
Net income $ 35.5 $ 32.0 $ 132.1 $ 91.2
Unvested restricted share participation (0.1) (0.1) (0.5) (0.4)
Net income per common share – basic $ 35.4 $ 31.9 $ 131.6 $ 90.8
Net income - basic (shares) 48.7 48.3 48.5 48.2
Net income - basic (EPS) $ 0.73 $ 0.66 $ 2.71 $ 1.88
Effect of dilutive securities:        
Nonparticipating unvested restricted shares $ 0.0 $ 0.0 $ 0.0 $ 0.0
Nonparticipating unvested restricted shares (shares) 0.1 0.2 0.2 0.3
Net income per common share – diluted $ 35.4 $ 31.9 $ 131.6 $ 90.8
Net income - diluted (shares) 48.8 48.5 48.7 48.5
Net income - diluted (EPS) $ 0.72 $ 0.66 $ 2.70 $ 1.87
Total weighted average restricted shares and antidilutive stock options 1.1 1.4 1.3 1.5