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NET INCOME PER SHARE (Tables)
9 Months Ended
Sep. 30, 2019
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., for the three and nine months ended September 30, 2019, and 2018 (in millions, except per share amounts):
 Three Months Ended 
September 30,
Nine Months Ended 
September 30,
 2019201820192018
Numerator:
Net income attributable to Intuitive Surgical, Inc.$396.8  $292.5  $1,021.6  $835.4  
Denominator:
Weighted average shares outstanding used in basic calculation115.4  114.0  115.3  113.4  
Add: dilutive effect of potential common shares3.9  5.2  4.1  5.2  
Weighted average shares outstanding used in diluted calculation119.3  119.2  119.4  118.6  
Net income per share attributable to Intuitive Surgical, Inc.:
Basic$3.44  $2.57  $8.86  $7.37  
Diluted$3.33  $2.45  $8.56  $7.04