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NET INCOME PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2020
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 attributable to Intuitive Surgical, Inc. (in millions, except per share amounts):
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |
Net income attributable to Intuitive Surgical, Inc. | $ | 68.0 |  |  | $ | 318.3 |  |  | $ | 381.5 |  |  | $ | 624.8 |
Denominator: |  |  |  |  |  |  |
Weighted average shares outstanding used in basic calculation | 116.8 |  |  | 115.4 |  |  | 116.6 |  |  | 115.2 |
Add: dilutive effect of potential common shares | 2.9 |  |  | 3.9 |  |  | 3.1 |  |  | 4.2 |
Weighted average shares outstanding used in diluted calculation | 119.7 |  |  | 119.3 |  |  | 119.7 |  |  | 119.4 |
Net income per share attributable to Intuitive Surgical, Inc.: |  |  |  |  |  |  |
Basic | $ | 0.58 |  |  | $ | 2.76 |  |  | $ | 3.27 |  |  | $ | 5.42 |
Diluted | $ | 0.57 |  |  | $ | 2.67 |  |  | $ | 3.19 |  |  | $ | 5.23 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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