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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, 2019	Mar. 31, 2018
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$ 306.5	$ 287.6
Denominator:
Weighted average shares outstanding used in basic calculation	115.0	112.8
Add: dilutive effect of potential common shares	4.6	5.2
Weighted average shares outstanding used in diluted calculation	119.6	118.0
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 2.67	$ 2.55
Diluted (in dollars per share)	$ 2.56	$ 2.44

X

- Definition

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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