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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
The following is a summary of our quarterly results of operations for the years ended December 31, 2018 and 2017:
 
 
For the Three Months Ended
(In millions except per share data)
 
December 31
 
September 30
 
June 30
 
March 31
Year ended December 31, 2018
 
 
 
 
 
 
 
 
Revenues
 
$
338.0

 
$
266.7

 
$
242.5

 
$
184.4

Gross profit
 
222.8

 
168.6

 
153.6

 
118.9

Total operating expenses
 
387.4

 
154.7

 
158.5

 
149.6

Net income (loss)
 
(179.7
)
 
46.6

 
30.2

 
(24.2
)
Basic net income (loss) per share (a)
 
$
(2.03
)
 
$
0.53

 
$
0.34

 
$
(0.28
)
Diluted net income (loss) per share (a)
 
$
(2.03
)
 
$
0.52

 
$
0.34

 
$
(0.28
)
 
 
 
 
 
 
 
 
 
Year ended December 31, 2017
 
 
 
 
 
 
 
 
Revenues
 
$
221.0

 
$
184.6

 
$
170.6

 
$
142.3

Gross profit
 
153.5

 
127.0

 
117.5

 
94.1

Total operating expenses
 
141.5

 
127.5

 
131.1

 
134.5

Net income (loss)
 
(9.4
)
 
(2.0
)
 
2.9

 
(41.7
)
Basic net income (loss) per share (a)
 
$
(0.11
)
 
$
(0.02
)
 
$
0.03

 
$
(0.49
)
Diluted net income (loss) per share (a)
 
$
(0.11
)
 
$
(0.02
)
 
$
0.03

 
$
(0.49
)
(a) Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.