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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The computation of basic and diluted earnings per share follows.
 Three Months Ended
September 30, 2023		Three Months Ended
September 30, 2022
 Income
(Loss)		Average
Shares		EPSIncome
(Loss)		Average
Shares		EPS
(in millions, except per share amounts)
Net income$35.5 $32.0 
Unvested restricted share participation(0.1)(0.1)
Net income per common share – basic35.4 48.7 $0.73 31.9 48.3 $0.66 
Effect of dilutive securities:
Nonparticipating unvested restricted shares— 0.1 — 0.2 
Net income per common share – diluted$35.4 48.8 $0.72 $31.9 48.5 $0.66 
 Nine Months Ended
September 30, 2023		Nine Months Ended
September 30, 2022
 Income
(Loss)		Average
Shares		EPSIncome
(Loss)		Average
Shares		EPS
(in millions, except per share amounts)
Net income$132.1 $91.2 
Unvested restricted share participation(0.5)(0.4)
Net income per common share – basic131.6 48.5 $2.71 90.8 48.2 $1.88 
Effect of dilutive securities:
Nonparticipating unvested restricted shares— 0.2 — 0.3 
Net income per common share – diluted$131.6 48.7 $2.70 $90.8 48.5 $1.87