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NET INCOME PER SHARE
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
NET INCOME PER SHARE 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, 2019, and 2018 (in millions, except per share amounts):
 
Three Months Ended 
June 30,
 
Six Months Ended 
June 30,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net income attributable to Intuitive Surgical, Inc.
$
318.3

 
$
255.3

 
$
624.8

 
$
542.9

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding used in basic calculation
115.4

 
113.5

 
115.2

 
113.2

Add: dilutive effect of potential common shares
3.9

 
5.0

 
4.2

 
5.1

Weighted average shares outstanding used in diluted calculation
119.3

 
118.5

 
119.4

 
118.3

Net income per share attributable to Intuitive Surgical, Inc.:
 
 
 
 
 
 
 
Basic
$
2.76

 
$
2.25

 
$
5.42

 
$
4.80

Diluted
$
2.67

 
$
2.15

 
$
5.23

 
$
4.59


Share-based compensation awards of approximately 1.2 million and 0.3 million shares for the three months ended June 30, 2019, and 2018, respectively, and approximately 0.5 million and 0.2 million for the six months ended June 30, 2019, and 2018, respectively, were outstanding, but were not included in the computation of diluted net income per share attributable to Intuitive Surgical, Inc. common stockholders because the effect of including such shares would have been anti-dilutive in the periods presented.