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NET INCOME PER SHARE
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
NET INCOME PER SHARE 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  
Share-based compensation awards of approximately 1.1 million and 1.2 million shares for the three months ended June 30, 2020, and 2019, respectively, and approximately 1.1 million and 0.5 million for the six months ended June 30, 2020, and 2019, respectively, were outstanding but were not included in the computation of diluted net income per share attributable to Intuitive Surgical, Inc. common stockholders because the effect of including such shares would have been anti-dilutive in the periods presented.