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Net Income Per Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income per Share

The Company computed basic and diluted net income per share as follows (in millions, except per share amounts):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income
$
179.8

 
$
140.0

 
$
288.6

 
$
231.4

Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute basic net income per share
380.4

 
382.8

 
380.6

 
383.0

Dilutive effect of employee stock awards
5.2

 
3.5

 
7.0

 
5.6

Weighted-average shares used to compute diluted net income per share
385.6

 
386.3

 
387.6

 
388.6

Net income per share
 
 
 
 
 
 
 
Basic
$
0.47

 
$
0.37

 
$
0.76

 
$
0.60

Diluted
$
0.47

 
$
0.36

 
$
0.74

 
$
0.60

 
 
 
 
 
 
 
 
Anti-dilutive shares
1.0

 
8.0

 
1.3

 
2.7