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Earnings Per Share

12 Months Ended

Dec. 31, 2018

The 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:



	Year Ended December 31,
(in millions)	2018	2017	2016
Basic weighted-average shares outstanding	150.9	155.4	163.6
Effect of dilutive securities ⁽¹⁾	2.7	2.8	2.4
Diluted weighted-average shares outstanding ⁽²⁾	153.6	158.2	166.0


(1)	The dilutive effect of outstanding stock options, restricted stock units, restricted stock, 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 0.2 million potential common shares excluded from diluted weighted-average shares outstanding for the years ended December 31, 2018, 2017 and 2016, respectively, as their inclusion would have had an anti-dilutive effect.