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NET INCOME PER SHARE (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Income Per Share
The following table presents the computation of basic and diluted net income per share attributable to Intuitive Surgical, Inc. (in millions, except per share amounts):
 Three Months Ended March 31,
 20212020
Numerator:
Net income attributable to Intuitive Surgical, Inc.$426.3 $313.5 
Denominator:
Weighted average shares outstanding used in basic calculation118.1 116.4 
Add: dilutive effect of potential common shares3.2 3.4 
Weighted average shares outstanding used in diluted calculation121.3 119.8 
Net income per share attributable to Intuitive Surgical, Inc.:
Basic$3.61 $2.69 
Diluted$3.51 $2.62