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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Operating Results
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
(In millions, except per share data)
2017
 
2017
 
2017
 
2017
Revenues
$
389.4

 
$
415.8

 
$
457.6

 
$
491.7

Income (loss) before income taxes
(54.3
)
 
(49.8
)
 
18.6

 
21.1

Net income (loss)(a)
(39.2
)
 
(27.6
)
 
12.8

 
214.3

Earnings (loss) per share:
 
 
 
 
 
 
 
Basic
$
(1.39
)
 
$
(0.98
)
 
$
0.45

 
$
7.57

Diluted
$
(1.39
)
 
$
(0.98
)
 
$
0.45

 
$
7.44


 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
(In millions, except per share data)
2016
 
2016
 
2016
 
2016
Revenues
$
365.6

 
$
380.4

 
$
403.6

 
$
405.2

Income (loss) before income taxes
(1.5
)
 
(2.7
)
 
6.7

 
(7.4
)
Net income (loss)
(1.5
)
 
(8.0
)
 
3.0

 
(13.2
)
Earnings (loss) per share:
 
 
 
 
 
 
 
Basic
$
(0.05
)
 
$
(0.28
)
 
$
0.11

 
$
(0.47
)
Diluted
$
(0.05
)
 
$
(0.28
)
 
$
0.11

 
$
(0.47
)