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Earnings Per Share
3 Months Ended
Mar. 31, 2025
Earnings Per Share [Abstract]  
Earnings Per Share
13.          Earnings Per Share
Three months ended
March 31, 2025March 31, 2024
Earnings/(loss) per common share
Net income/(loss)$(42.5)$81.2 
Weighted average common shares outstanding111,543,154 117,658,016 
Earnings/(loss) per common share$(0.38)$0.69 
Earnings/(loss) per diluted common share
Net income/(loss)$(42.5)$81.2 
Weighted average common shares outstanding111,543,154 117,658,016 
Share-based compensation plans— 690,368 
Weighted average diluted common shares outstanding111,543,154 118,348,384 
Earnings/(loss) per diluted common share$(0.38)$0.69 
Share-based compensation plans are excluded from the calculation of diluted loss per share in the three months ended March 31, 2025 as their effect is anti-dilutive.