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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Earnings Per Share
The reconciliation of basic and diluted earnings per share on common stock for the first quarter 2024 and 2023 follows (in millions of dollars except per share data):
 First Quarter
 20242023
Net earnings$25.8 $10.9 
Less: earnings allocated to participating securities(0.6)(0.2)
Net earnings available to common shareholders$25.2 $10.7 
Average shares outstanding (millions):
Basic35.4 37.1 
Dilutive share awards0.4 0.3 
Diluted35.8 37.4 
Basic earnings per share$0.71 $0.29 
Diluted earnings per share$0.70 $0.29