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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 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 second quarter and June year-to-date 2024 and 2023 follows (in millions of dollars except per share data):
 Second QuarterJune Year to Date
 2024202320242023
Net earnings$4.6 $7.5 $30.4 $18.4 
Less: earnings allocated to participating securities(0.1)(0.2)(0.7)(0.4)
Net earnings available to common shareholders$4.5 $7.3 $29.7 $18.0 
Average shares outstanding (millions):
Basic35.5 36.0 35.5 36.5 
Dilutive share awards0.4 0.4 0.4 0.4 
Diluted35.9 36.4 35.9 36.9 
Basic earnings per share$0.13 $0.20 $0.84 $0.49 
Diluted earnings per share$0.12 $0.20 $0.83 $0.49