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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator:        
Net income attributable to Intuitive Surgical, Inc. $ 255.3 $ 223.0 $ 542.9 $ 403.8
Denominator:        
Weighted average shares outstanding used in basic calculation 113.5 111.0 113.2 111.6
Add: dilutive effect of potential common shares 5.0 4.2 5.1 3.9
Weighted average shares outstanding used in diluted calculation 118.5 115.2 118.3 115.5
Net income per share attributable to Intuitive Surgical, Inc.:        
Basic (in dollars per share) $ 2.25 $ 2.01 $ 4.80 $ 3.62
Diluted (in dollars per share) $ 2.15 $ 1.94 $ 4.59 $ 3.50