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NET INCOME PER SHARE (Tables)
9 Months Ended
Sep. 30, 2018
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, 2018, and 2017 (in millions, except per share amounts):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income attributable to Intuitive Surgical, Inc.
$
292.5

 
$
298.6

 
$
835.4

 
$
702.4

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding used in basic calculation
114.0

 
111.8

 
113.4

 
111.6

Add: dilutive effect of potential common shares
5.2

 
5.0

 
5.2

 
4.3

Weighted average shares outstanding used in diluted calculation
119.2

 
116.8

 
118.6

 
115.9

Net income per share attributable to Intuitive Surgical, Inc.:
 
 
 
 
 
 
 
Basic
$
2.57

 
$
2.67

 
$
7.37

 
$
6.29

Diluted
$
2.45

 
$
2.56

 
$
7.04

 
$
6.06