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Net Income Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Income Per Share | 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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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