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Net Income Per Share | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Net Income Per Share | 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:
| Three Months Ended March 31,
(in millions) | 2019 |  | 2018
Net income | $ | 55.4 |  |  | $ | 43.6 |
Weighted average common shares outstanding | 74.1 |  |  | 73.9 |
Dilutive effect of equity awards, based on the treasury stock method | 1.2 |  |  | 1.6 |
Weighted average shares assuming dilution | 75.3 |  |  | 75.5 |
During the three months ended March 31, 2019 and 2018, there were 0.6 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 February 2019, we announced a share repurchase program for calendar-year 2019 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 the three months ended March 31, 2019, we purchased 800,000 shares of our common stock under the now-completed program at a cost of $83.1 million, or an average price of $103.89 per share.

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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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