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NET INCOME PER SHARE (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net income attributable to Intuitive Surgical, Inc. | $ | 380.5 |  |  | $ | 313.9 |  |  | $ | 1,324.0 |  |  | $ | 695.4 |
Denominator: |  |  |  |  |  |  |
Weighted average shares outstanding used in basic calculation | 356.8 |  |  | 352.0 |  |  | 355.6 |  |  | 350.5 |
Add: dilutive effect of potential common shares | 10.0 |  |  | 9.9 |  |  | 9.5 |  |  | 9.6 |
Weighted average shares outstanding used in diluted calculation | 366.8 |  |  | 361.9 |  |  | 365.1 |  |  | 360.1 |
Net income per share attributable to Intuitive Surgical, Inc.: |  |  |  |  |  |  |
Basic | $ | 1.07 |  |  | $ | 0.89 |  |  | $ | 3.72 |  |  | $ | 1.98 |
Diluted | $ | 1.04 |  |  | $ | 0.87 |  |  | $ | 3.63 |  |  | $ | 1.93 |

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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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