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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings per Share
The weighted average number of common shares used in the calculation of basic and diluted earnings per share consisted of the following (in millions):
 Second QuarterSix Months
2024202320242023
Weighted average basic common shares outstanding47.2 47.0 47.3 47.0 
Effect of dilutive securities (primarily stock options)0.6 0.9 0.6 0.9 
Weighted average diluted common shares outstanding47.8 47.9 47.9 47.9