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NET INCOME PER SHARE (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018, and 2017 (in millions, except per share amounts):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income attributable to Intuitive Surgical, Inc.
$
255.3

 
$
223.0

 
$
542.9

 
$
403.8

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding used in basic calculation
113.5

 
111.0

 
113.2

 
111.6

Add: dilutive effect of potential common shares
5.0

 
4.2

 
5.1

 
3.9

Weighted average shares outstanding used in diluted calculation
118.5

 
115.2

 
118.3

 
115.5

Net income per share attributable to Intuitive Surgical, Inc.:
 
 
 
 
 
 
 
Basic
$
2.25

 
$
2.01

 
$
4.80

 
$
3.62

Diluted
$
2.15

 
$
1.94

 
$
4.59

 
$
3.50