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Net Income Per Share | 6 Months Ended
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Jun. 30, 2018
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 June 30, |  | Six Months Ended June 30,
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Net income | $ | 56.1 |  |  | $ | 38.8 |  |  | $ | 99.7 |  |  | $ | 99.7 |
Weighted average common shares outstanding | 73.6 |  |  | 73.9 |  |  | 73.8 |  |  | 73.6 |
Dilutive effect of equity awards, based on the treasury stock method | 1.4 |  |  | 1.9 |  |  | 1.4 |  |  | 2.1 |
Weighted average shares assuming dilution | 75.0 |  |  | 75.8 |  |  | 75.2 |  |  | 75.7 |
During the three months ended June 30, 2018 and 2017, there were 0.9 million and 0.5 million shares, respectively, from stock-based compensation plans not included in the computation of diluted net income per share because their impact was antidilutive. There were 0.8 million and 0.3 million antidilutive shares outstanding during the six months ended June 30, 2018 and 2017, respectively. 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 to be repurchased and the timing of such transactions will depend on a variety of factors, including market conditions. During the three months ended June 30, 2018, we purchased 260,000 shares of our common stock under the program at a cost of $22.9 million, or an average price of $88.03 per share. During the six months ended June 30, 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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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