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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								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to Intuitive Surgical, Inc.	$ 365.2	$ 313.9	$ 68.0	$ 313.5	$ 357.7	$ 396.8	$ 318.3	$ 306.5	$ 1,060.6	$ 1,379.3	$ 1,127.9
Weighted-average shares outstanding basic (shares)									117.0	115.4	113.7
Add: Dilutive potential shares									3.3	4.1	5.1
Weighted-average shares used in computing diluted net income per share (shares)									120.3	119.5	118.8
Basic net income per share (usd per share)	$ 3.11	$ 2.68	$ 0.58	$ 2.69	$ 3.09	$ 3.44	$ 2.76	$ 2.67	$ 9.06	$ 11.95	$ 9.92
Diluted net income per share (usd per share)	$ 3.02	$ 2.60	$ 0.57	$ 2.62	$ 2.99	$ 3.33	$ 2.67	$ 2.56	$ 8.82	$ 11.54	$ 9.49

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