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NET INCOME PER SHARE (Tables)
9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
 2020201920202019
Numerator:
Net income attributable to Intuitive Surgical, Inc.$313.9 $396.8 $695.4 $1,021.6 
Denominator:
Weighted average shares outstanding used in basic calculation117.3 115.4 116.8 115.3 
Add: dilutive effect of potential common shares3.3 3.9 3.2 4.1 
Weighted average shares outstanding used in diluted calculation120.6 119.3 120.0 119.4 
Net income per share attributable to Intuitive Surgical, Inc.:
Basic$2.68 $3.44 $5.95 $8.86 
Diluted$2.60 $3.33 $5.80 $8.56