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Net Income per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Calculation of Basic and Diluted Net Income (Loss) Per Share
The Company computed basic and diluted net income (loss) per share as follows (in millions, except per share amounts):
 
Years Ended December 31,
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net income (loss)
$
592.7

 
$
633.7

 
$
(334.3
)
Denominator:
 
 
 
 
 
Weighted-average shares used to compute basic net income (loss)
   per share
381.7

 
390.6

 
457.4

Dilutive effect of employee stock awards
6.1

 
8.8

 
—

Weighted-average shares used to compute diluted net income (loss)
   per share
387.8

 
399.4

 
457.4

Net income (loss) per share:
 
 
 
 
 
Basic
$
1.55

 
$
1.62

 
$
(0.73
)
Diluted
$
1.53

 
$
1.59

 
$
(0.73
)
 
 
 
 
 
 
Anti-dilutive:
 
 
 
 
 
Potential anti-dilutive shares
2.5

 
3.4

 
20.8