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Earnings Per Common Share
 12 Months Ended
Dec. 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 1.0 million shares, 1.2 million shares, and 1.3 million shares, for the years ended December 31, 2025, 2024, and 2023, respectively.
The computation of basic and diluted earnings per share follows.
 Year Ended December 31, 2025
 (in millions, except per share amounts)
 Income
(Loss)		Average
Shares		EPS
Net income$208.4 
Unvested restricted share participation(0.4)
Net income per common share – basic208.0 48.9 $4.25 
Effect of dilutive securities:
Nonparticipating unvested restricted shares— 0.1 
Net income per common share – diluted$208.0 49.0 $4.24 
 Year Ended December 31, 2024
 (in millions, except per share amounts)
 Income
(Loss)		Average
Shares		EPS
Net income$93.7 
Unvested restricted share participation(0.3)
Net income per common share – basic93.4 48.6 $1.92 
Effect of dilutive securities:
Nonparticipating unvested restricted shares— 0.2 
Net income per common share – diluted$93.4 48.8 $1.91 
 Year Ended December 31, 2023
 (in millions, except per share amounts)
 Income
(Loss)		Average
Shares		EPS
Net income$159.2 
Unvested restricted share participation(0.6)
Net income per common share – basic158.6 48.5 $3.27 
Effect of dilutive securities:
Nonparticipating unvested restricted shares— 0.2 
Net income per common share – diluted$158.6 48.7 $3.26