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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 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. (in millions, except per share amounts):
 
Years Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income attributable to Intuitive Surgical, Inc.
$
1,127.9

 
$
670.9

 
$
738.3

Denominator:
 
 
 
 
 
Weighted average shares outstanding used in basic calculation
113.7

 
111.7

 
114.9

Add: dilutive effect of potential common shares
5.1

 
4.6

 
3.0

Weighted average shares outstanding used in diluted calculation
118.8

 
116.3

 
117.9

Net income per share attributable to Intuitive Surgical, Inc.:
 
 
 
 
 
Basic
$
9.92

 
$
6.01

 
$
6.43

Diluted
$
9.49

 
$
5.77

 
$
6.26