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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income attributable to Intuitive Surgical, Inc. $ 380.5 $ 313.9 $ 1,324.0 $ 695.4
Denominator:        
Weighted average shares outstanding used in basic calculation 356.8 352.0 355.6 350.5
Add: dilutive effect of potential common shares 10.0 9.9 9.5 9.6
Weighted average shares outstanding used in diluted calculation 366.8 361.9 365.1 360.1
Net income per share attributable to Intuitive Surgical, Inc.:        
Basic (in dollars per share) $ 1.07 $ 0.89 $ 3.72 $ 1.98
Diluted (in dollars per share) $ 1.04 $ 0.87 $ 3.63 $ 1.93