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Quarterly Financial Information (Unaudited) Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (Unaudited)
11. Quarterly Financial Information (Unaudited)
The following is a summary of our quarterly results of operations for the years ended December 31, 2019 and 2018:
 
 
For the Three Months Ended
(In millions except per share data)
 
December 31
 
September 30
 
June 30
 
March 31
Year ended December 31, 2019
 
 
 
 
 
 
 
 
Revenues
 
$
462.8

 
$
396.3

 
$
336.4

 
$
280.5

Gross profit
 
309.3

 
246.9

 
206.5

 
168.8

Total operating expenses
 
207.8

 
190.9

 
207.3

 
183.2

Net income (loss)
 
92.7

 
45.8

 
(10.5
)
 
(26.9
)
Basic net income (loss) per share (1)
 
$
1.01

 
$
0.50

 
$
(0.12
)
 
$
(0.30
)
Diluted net income (loss) per share (1)
 
$
1.00

 
$
0.50

 
$
(0.12
)
 
$
(0.30
)
 
 
 
 
 
 
 
 
 
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 (1)
 
$
(2.03
)
 
$
0.53

 
$
0.34

 
$
(0.28
)
Diluted net income (loss) per share (1)
 
$
(2.03
)
 
$
0.52

 
$
0.34

 
$
(0.28
)
(1) 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.