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Earnings Per Common Share (Tables)
3 Months Ended
Mar. 31, 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
March 31, 2023
Three Months Ended
March 31, 2022
 Income
(Loss)
Average
Shares
EPSIncome
(Loss)
Average
Shares
EPS
(in millions, except per share amounts)
Net income$55.7 $20.2 
Unvested restricted share participation(0.2)(0.1)
Net income per common share – basic55.5 48.3 $1.15 20.1 48.2 $0.42 
Effect of dilutive securities:
Nonparticipating unvested restricted shares 0.5 — 0.6 
Net income per common share – diluted$55.5 48.8 $1.14 $20.1 48.8 $0.41