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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, 2023
Mar. 31, 2022
Earnings Per Share Reconciliation [Abstract]    
Net income $ 55.7 $ 20.2
Unvested restricted share participation (0.2) (0.1)
Net income per common share – basic $ 55.5 $ 20.1
Net income - basic (shares) 48.3 48.2
Net income - basic (EPS) $ 1.15 $ 0.42
Effect of dilutive securities:    
Nonparticipating unvested restricted shares $ 0.0 $ 0.0
Nonparticipating unvested restricted shares (shares) 0.5 0.6
Net income per common share – diluted $ 55.5 $ 20.1
Net income - diluted (shares) 48.8 48.8
Net income - diluted (EPS) $ 1.14 $ 0.41
Total weighted average restricted shares and antidilutive stock options 1.3 1.6