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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 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):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |
Net income attributable to Intuitive Surgical, Inc. | $ | 1,060.6 |  |  | $ | 1,379.3 |  |  | $ | 1,127.9 |
Denominator: |  |  |  |  |
Weighted average shares outstanding used in basic calculation | 117.0 |  |  | 115.4 |  |  | 113.7 |
Add: dilutive effect of potential common shares | 3.3 |  |  | 4.1 |  |  | 5.1 |
Weighted average shares outstanding used in diluted calculation | 120.3 |  |  | 119.5 |  |  | 118.8 |
Net income per share attributable to Intuitive Surgical, Inc.: |  |  |  |  |
Basic | $ | 9.06 |  |  | $ | 11.95 |  |  | $ | 9.92 |
Diluted | $ | 8.82 |  |  | $ | 11.54 |  |  | $ | 9.49 |

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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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