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Earnings Per Share
 3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Earnings Per Share 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):
 First Quarter
20242023
Weighted average basic common shares outstanding47.3 46.9 
Effect of dilutive securities (primarily stock options)0.7 1.0 
Weighted average diluted common shares outstanding48.0 47.9 
For the first quarter of 2024 and 2023, the Company excluded approximately 0.2 million of stock options in the computation of diluted earnings per share because the effect of their inclusion would have been anti-dilutive.