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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE Basic and diluted net income per share are computed by dividing net income by the weighted-average number of common shares outstanding. Diluted net income per share reflects the dilutive effect of stock-based compensation.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Computation of Income per Share | (In millions, except per share data)
Net income | $ | 195.1 |  |  | $ | 52.7 |  |  | $ | 274.6 |  |  | $ | 60.2 |
Basic shares | 167.0 |  |  | 166.3 |  |  | 167.1 |  |  | 166.0 |
Basic net income per share | $ | 1.17 |  |  | $ | 0.32 |  |  | $ | 1.64 |  |  | $ | 0.36 |
Diluted shares: |  |  |  |  |  |  |
Basic shares | 167.0 |  |  | 166.3 |  |  | 167.1 |  |  | 166.0 |
Stock-based compensation | 1.6 |  |  | 2.2 |  |  | 1.8 |  |  | 2.2 |
Diluted shares | 168.6 |  |  | 168.5 |  |  | 168.9 |  |  | 168.2 |
Diluted net income per share | $ | 1.16 |  |  | $ | 0.31 |  |  | $ | 1.63 |  |  | $ | 0.36 |
The computation of dilutive shares from stock-based compensation does not include 2.4 million and 1.6 million shares for the three months ended September 30, 2018 and 2017, respectively, and 2.4 million and 1.6 million shares for the nine months ended September 30, 2018 and 2017, respectively, as their effect would have been anti-dilutive.

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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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