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NET INCOME PER SHARE (Tables)
6 Months Ended
Jun. 30, 2020
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 June 30,Six Months Ended June 30,
 2020201920202019
Numerator:
Net income attributable to Intuitive Surgical, Inc.$68.0  $318.3  $381.5  $624.8  
Denominator:
Weighted average shares outstanding used in basic calculation116.8  115.4  116.6  115.2  
Add: dilutive effect of potential common shares2.9  3.9  3.1  4.2  
Weighted average shares outstanding used in diluted calculation119.7  119.3  119.7  119.4  
Net income per share attributable to Intuitive Surgical, Inc.:
Basic$0.58  $2.76  $3.27  $5.42  
Diluted$0.57  $2.67  $3.19  $5.23