Earnings Per Share

9 Months Ended

Sep. 30, 2022

Earnings per Share

The denominator for basic and diluted earnings per share for the three and nine months ended September 30, 2022 and 2021 is as follows:


	Three Months Ended September 30		Nine Months Ended September 30
	2022	2021	2022	2021
Denominator for basic earnings per share – weighted-average shares	239.6	243.4	240.5	244.3
Effect of dilutive securities – employee stock options, nonvested restricted stock awards and convertible debentures	2.6	2.6	2.8	2.9
Denominator for diluted earnings per share	242.2	246.0	243.3	247.2

During the three months ended September 30, 2022 and 2021, weighted-average shares related to certain stock options of 0.5 and 0.0, respectively, were excluded from the denominator for diluted earnings per share because the stock options were anti-dilutive. During the nine months ended September 30, 2022 and 2021, weighted-average shares related to certain stock options of 0.4 and 0.3, respectively, were excluded from each of the denominators for diluted earnings per share because the stock options were anti-dilutive.

During the three and nine months ended September 30, 2022, we issued approximately 0.0 and 0.6 restricted stock units under our stock incentive plans, 0.0 and 0.2 of which vesting is contingent upon us meeting specified annual earnings targets for the three year period of 2022 through 2024. During the three and nine months ended September 30, 2021, we issued approximately 0.1 and 1.0 restricted stock units under our stock incentive plans, 0.0 and 0.3 of which vesting is contingent upon us meeting specified annual earnings targets for the three year period of 2021 through 2023. The contingent restricted stock units have been excluded from the denominators for diluted earnings per share and will be included only if and when the contingency is met.