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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted
The Company computed basic and diluted net income per share as follows (in millions, except per share amounts):
 
Three Months Ended March 31,
 
2017
 
2016
Numerator:
 
 
 
Net income
$
108.8

 
$
91.4

Denominator:
 
 
 
Weighted-average shares used to compute basic net income per share
380.9

 
383.2

Dilutive effect of employee stock awards
7.1

 
6.1

Weighted-average shares used to compute diluted net income per share
388.0

 
389.3

Net income per share
 
 
 
Basic
$
0.29

 
$
0.24

Diluted
$
0.28

 
$
0.23

 
 
 
 
Anti-dilutive shares
1.6

 
4.0