Earnings per Share

6 Months Ended

Jun. 30, 2021

Earnings Per ShareThe numerator for both basic and diluted earnings per share is Net income. The denominator for basic earnings per share is the weighted-average shares outstanding during the period.

A reconciliation of basic weighted-average shares outstanding to diluted weighted-average shares outstanding is as follows:


	Three Months Ended June 30,		Six Months Ended June 30,
	2021	2020	2021	2020
Basic weighted-average shares outstanding	139.8	142.4	140.6	142.5
Effect of dilutive securities(1)	1.9	1.9	1.8	2.1
Diluted weighted-average shares outstanding(2)	141.7	144.3	142.4	144.6

(1)The dilutive effect of outstanding stock options, restricted stock units, performance share units and Coworker Stock Purchase Plan units is reflected in the diluted weighted-average shares outstanding using the treasury stock method.

(2)There were fewer than 0.1 million potential common shares excluded from diluted weighted-average shares outstanding for both the three and six months ended June 30, 2021 and 2020 as their inclusion would have had an anti-dilutive effect.