Earnings Per Share

6 Months Ended

Jun. 30, 2019

Earnings per Share

The denominator for basic and diluted earnings per share for the three and six months ended June 30, 2019 and 2018 is as follows:



	Three Months Ended June 30		Six Months Ended June 30
	2019	2018	2019	2018
Denominator for basic earnings per share – weighted-average shares	256.7	258.7	256.9	257.3
Effect of dilutive securities – employee stock options, nonvested restricted stock awards, convertible debentures and equity units	4.3	5.8	4.7	6.4
Denominator for diluted earnings per share	261.0	264.5	261.6	263.7

During the three months ended June 30, 2019 and 2018, weighted-average shares related to certain stock options of 0.7 and 0.8, respectively, were excluded from the denominator for diluted earnings per share because the stock options were anti-dilutive. During each of the six months ended June 30, 2019 and 2018, weighted-average shares related to certain stock options of 0.5 were excluded from the denominator for diluted earnings per share because the stock options were anti-dilutive.

During the three and six months ended June 30, 2019, we issued approximately 0.0 and 0.5 restricted stock units under our stock incentive plans, 0.2 of which vesting is contingent upon us meeting specified annual earnings targets for the three year period of 2019 through 2021. During the three and six months ended June 30, 2018, we issued approximately 0.1 and 0.9 restricted stock units under our stock incentive plans, 0.3 of which vesting is contingent upon us meeting specified annual earnings targets for the three year period of 2018 through 2020. The contingent restricted stock units have been excluded from the denominator for diluted earnings per share and will be included only if and when the contingency is met.