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Earnings Per Common Share
 3 Months Ended
Mar. 31, 2025
Earnings Per Share [Abstract]  
Earnings per Common Share Earnings Per Common Share
Basic earnings per common share is computed by dividing net income remaining after allocation to participating unvested restricted shares by the weighted average number of basic common shares outstanding for the period. Except when the effect would be antidilutive, the calculation of diluted earnings per common share includes the weighted average net impact of nonparticipating unvested restricted shares. Total weighted average restricted shares were 1.2 million for the three months ended March 31, 2025 and 2024.
The computation of basic and diluted earnings per share follows.
 Three Months Ended
March 31, 2025		Three Months Ended
March 31, 2024
 Income
(Loss)		Average
Shares		EPSIncome
(Loss)		Average
Shares		EPS
(in millions, except per share amounts)
Net income$23.6 $39.2 
Unvested restricted share participation(0.1)(0.1)
Net income per common share – basic23.5 48.7 $0.48 39.1 48.5 $0.81 
Effect of dilutive securities:
Nonparticipating unvested restricted shares— 0.5 — 0.4 
Net income per common share – diluted$23.5 49.2 $0.48 $39.1 48.9 $0.80