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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income attributable to Intuitive Surgical, Inc. $ 517.2 $ 68.0 $ 943.5 $ 381.5
Denominator:        
Weighted average shares outstanding used in basic calculation 118.6 116.8 118.3 116.6
Add: dilutive effect of potential common shares 3.0 2.9 3.2 3.1
Weighted average shares outstanding used in diluted calculation 121.6 119.7 121.5 119.7
Net income per share attributable to Intuitive Surgical, Inc.:        
Basic (in dollars per share) $ 4.36 $ 0.58 $ 7.98 $ 3.27
Diluted (in dollars per share) $ 4.25 $ 0.57 $ 7.77 $ 3.19