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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
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,
 
2018
 
2017
Numerator:
 
 
 
Net income
$
34.4

 
$
108.8

Denominator:
 
 
 
Weighted-average shares used to compute basic net income per share
355.3

 
380.9

Dilutive effect of employee stock awards
5.3

 
7.1

Weighted-average shares used to compute diluted net income per share
360.6

 
388.0

Net income per share
 
 
 
Basic
$
0.10

 
$
0.29

Diluted
$
0.10

 
$
0.28

 
 
 
 
Anti-dilutive shares
10.4

 
1.6