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NET INCOME PER SHARE - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$ 426.3	$ 313.5
Denominator:
Weighted average shares outstanding used in basic calculation	118.1	116.4
Add: dilutive effect of potential common shares	3.2	3.4
Weighted average shares outstanding used in diluted calculation	121.3	119.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 3.61	$ 2.69
Diluted (in dollars per share)	$ 3.51	$ 2.62

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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