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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]                      
Net income attributable to Intuitive Surgical, Inc. $ 380.6 $ 380.5 $ 517.2 $ 426.3 $ 365.2 $ 313.9 $ 68.0 $ 313.5 $ 1,704.6 $ 1,060.6 $ 1,379.3
Weighted-average shares outstanding basic (shares)                 356.1 351.1 346.2
Add: dilutive effect of potential common shares                 9.7 9.9 12.2
Weighted-average shares used in computing diluted net income per share (shares)                 365.8 361.0 358.4
Basic net income per share (usd per share) $ 1.07 $ 1.07 $ 1.45 $ 1.20 $ 3.11 $ 2.68 $ 0.58 $ 2.69 $ 4.79 $ 3.02 $ 3.98
Diluted net income per share (usd per share) $ 1.03 $ 1.04 $ 1.42 $ 1.17 $ 3.02 $ 2.60 $ 0.57 $ 2.62 $ 4.66 $ 2.94 $ 3.85