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Net Income Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Net Income Per Share | NET INCOME PER SHARE The following table presents the computation of basic and diluted net income per share (in millions, except per share amounts):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net income | $ | 660.0 |  |  | $ | 735.9 |  |  | $ | 588.8 |
Denominator: |  |  |  |  |
Weighted-average shares outstanding in basic calculation | 111.7 |  |  | 114.9 |  |  | 111.3 |
Add: dilutive effect of potential common shares | 4.6 |  |  | 3.0 |  |  | 2.4 |
Weighted-average shares used in computing diluted net income per share | 116.3 |  |  | 117.9 |  |  | 113.7 |
Net income per share: |  |  |  |  |
Basic | $ | 5.91 |  |  | $ | 6.40 |  |  | $ | 5.29 |
Diluted | $ | 5.67 |  |  | $ | 6.24 |  |  | $ | 5.18 |
Share-based compensation awards of approximately 0.2 million, 0.6 million, and 5.0 million shares for the years ended December 31, 2017, 2016, and 2015, respectively, were outstanding, but were not included in the computation of diluted net income per share because the effect of including such shares would have been anti-dilutive in the periods presented.

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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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