Note 4: Net Income Per Share

The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:



(in millions)	2018		2017		2016
Net income	$	206.9	$	150.7	$	143.6
Weighted average common shares outstanding	73.9		73.9		73.3
Dilutive effect of equity awards, based on the treasury stock method	1.5		1.9		1.7
Weighted average shares assuming dilution	75.4		75.8		75.0

During 2018, 2017 and 2016, there were 0.4 million, 0.4 million, and 0.1 million shares, respectively, from stock-based compensation plans not included in the computation of diluted net income per share because their impact was antidilutive.

In February 2018, we announced a share repurchase program for calendar-year 2018 authorizing the repurchase of up to 800,000 shares of our common stock from time to time on the open market or in privately-negotiated transactions as permitted under the Securities Exchange Act of 1934 Rule 10b-18. The number of shares repurchased and the timing of such transactions depended on a variety of factors, including market conditions. During 2018, we purchased 800,000 shares of our common stock under the program at a cost of $70.8 million, or an average price of $88.51 per share. Please refer to Note 19, Subsequent Events, for discussion of our share repurchase program for calendar-year 2019.