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Earnings Per Share (EPS)
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Share (EPS) EARNINGS PER SHARE ("EPS")
Basic EPS is calculated by dividing Net earnings attributable to Allegion plc by the weighted-average number of ordinary shares outstanding for the applicable period. Diluted EPS is calculated after adjusting the denominator of the basic EPS calculation for the effect of all potentially dilutive ordinary shares, which in the Company’s case includes shares issuable under share-based compensation plans.
The following table summarizes the weighted-average number of ordinary shares outstanding for basic and diluted EPS calculations for the three and six months ended June 30:
Three months endedSix months ended
In millions2024202320242023
Weighted-average number of basic shares87.3 87.9 87.5 88.0 
Shares issuable under share-based compensation plans0.4 0.4 0.4 0.3 
Weighted-average number of diluted shares87.7 88.3 87.9 88.3 
At June 30, 2024 and 2023, 0.3 million and 0.5 million stock options, respectively, were excluded from the computation of weighted-average diluted shares outstanding because the effect of including these shares would have been anti-dilutive.