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NET INCOME PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2021
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net income attributable to Intuitive Surgical, Inc. | $ | 517.2 |  |  | $ | 68.0 |  |  | $ | 943.5 |  |  | $ | 381.5 |
Denominator: |  |  |  |  |  |  |
Weighted average shares outstanding used in basic calculation | 118.6 |  |  | 116.8 |  |  | 118.3 |  |  | 116.6 |
Add: dilutive effect of potential common shares | 3.0 |  |  | 2.9 |  |  | 3.2 |  |  | 3.1 |
Weighted average shares outstanding used in diluted calculation | 121.6 |  |  | 119.7 |  |  | 121.5 |  |  | 119.7 |
Net income per share attributable to Intuitive Surgical, Inc.: |  |  |  |  |  |  |
Basic | $ | 4.36 |  |  | $ | 0.58 |  |  | $ | 7.98 |  |  | $ | 3.27 |
Diluted | $ | 4.25 |  |  | $ | 0.57 |  |  | $ | 7.77 |  |  | $ | 3.19 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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