Net Income Per Share

12 Months Ended

Dec. 31, 2017

Note 3: 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)	2017		2016		2015
Net income	$	150.7	$	143.6	$	95.6
Weighted average common shares outstanding	73.9		73.3		72.0
Dilutive effect of equity awards, based on the treasury stock method	1.9		1.7		1.8
Weighted average shares assuming dilution	75.8		75.0		73.8

During 2017, 2016 and 2015, there were 0.4 million, 0.1 million, and 0.7 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 December 2016, we announced a share repurchase program 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. During 2017, we purchased 800,000 shares of our common stock under this program at a cost of $74.4 million, or an average price of $92.96 per share. This share repurchase program expired on December 31, 2017. Please refer to Note 18, Subsequent Events, for discussion of our share repurchase program for calendar-year 2018.