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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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