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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Schedule of Selected Quarterly Financial Data (Unaudited)
The table below sets forth selected unaudited financial data for each quarter of the years ended December 31, 2017 and December 31, 2016 (in millions, except per share amounts):
 
Year Ended December 31, 2017
 
Year Ended December 31, 2016
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Net revenues
$
1,221.0

 
$
1,308.9

 
$
1,257.8

 
$
1,239.5

 
$
1,097.9

 
$
1,221.3

 
$
1,285.3

 
$
1,385.6

Gross margin
746.6

 
801.9

 
772.4

 
751.2

 
690.9

 
756.4

 
799.5

 
857.7

Income before income taxes
140.6

 
245.2

 
225.8

 
200.2

 
126.5

 
192.2

 
236.6

 
272.1

Net income (loss)(1)
$
108.8

 
$
179.8

 
$
165.7

 
$
(148.1
)
 
$
91.4

 
$
140.0

 
$
172.4

 
$
188.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) per share:(2)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.29

 
$
0.47

 
$
0.44

 
$
(0.40
)
 
$
0.24

 
$
0.37

 
$
0.45

 
$
0.50

Diluted(3)
$
0.28

 
$
0.47

 
$
0.43

 
$
(0.40
)
 
$
0.23

 
$
0.36

 
$
0.45

 
$
0.49

 
_______________
(1) 
Net loss for the fourth quarter of 2017 includes an estimated $289.5 million of tax expense related to the Tax Act, and restructuring charges of $36.2 million.
(2) 
Net income (loss) per share is computed independently. Therefore, the sum of the quarterly net income per share may not equal the total computed for the year or any cumulative interim period.
(3) 
Potentially dilutive common shares for the fourth quarter of 2017 were excluded from the computation of diluted net loss per share because their effect would be anti-dilutive.