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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$ 396.8	$ 292.5	$ 1,021.6	$ 835.4
Denominator:
Weighted average shares outstanding used in basic calculation	115.4	114.0	115.3	113.4
Add: dilutive effect of potential common shares	3.9	5.2	4.1	5.2
Weighted average shares outstanding used in diluted calculation	119.3	119.2	119.4	118.6
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 3.44	$ 2.57	$ 8.86	$ 7.37
Diluted (in dollars per share)	$ 3.33	$ 2.45	$ 8.56	$ 7.04

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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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