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Net Income Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income Per Share | 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 |
Share-based compensation awards of approximately 0.6 million, 0.7 million, and 0.4 million shares for the years ended December 31, 2020, 2019, and 2018, respectively, were outstanding but were not included in the computation of diluted net income per share attributable to Intuitive Surgical, Inc. common stockholders, because the effect of including such shares would have been anti-dilutive in the periods presented.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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