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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, 2018	Mar. 31, 2017
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$ 287.6	$ 180.8
Denominator:
Weighted average shares outstanding used in basic calculation	112.8	111.9
Add: dilutive effect of potential common shares	5.2	3.6
Weighted average shares outstanding used in diluted calculation	118.0	115.5
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 2.55	$ 1.62
Diluted (in dollars per share)	$ 2.44	$ 1.57

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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