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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income
$
116.5

 
$
179.8

 
$
150.9

 
$
288.6

Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute basic net income per share
349.0

 
380.4

 
352.2

 
380.6

Dilutive effect of employee stock awards
2.3

 
5.2

 
4.6

 
7.0

Weighted-average shares used to compute diluted net income per share
351.3

 
385.6

 
356.8

 
387.6

Net income per share
 
 
 
 
 
 
 
Basic
$
0.33

 
$
0.47

 
$
0.43

 
$
0.76

Diluted
$
0.33

 
$
0.47

 
$
0.42

 
$
0.74

 
 
 
 
 
 
 
 
Anti-dilutive shares
10.2

 
1.0

 
3.9

 
1.3