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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Quarterly Financial Information [Table Text Block]
 
2017
 
First
 
Second
 
Third
 
Fourth
 
 
(in millions, except per common share amounts)
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Total
Revenue
$
278.2

 
$
294.0

 
$
289.2

 
$
427.1

 
$
1,288.5

Operating (loss) income
(5.3
)
 
20.9

 
12.7

 
9.8

 
38.1

Net income (loss)
60.4

 
2.1

 
(11.2
)
 
(16.2
)
 
35.1

 
 
 
 
 
 
 
 
 
 
Net basic earnings (loss) per common share
$
1.37

 
$
(0.01
)
 
$
(0.33
)
 
$
(0.45
)
 
$
0.59

 
 
 
 
 
 
 
 
 
 
Net diluted earnings (loss) per common share
$
1.37

 
$
(0.01
)
 
$
(0.33
)
 
$
(0.45
)
 
$
0.58

 
 
 
 
 
 
 
 
 
 
 
2016
 
First
 
Second
 
Third
 
Fourth
 
 
(in millions, except per common share amounts)
Quarter
 
Quarter
 
Quarter
 
Quarter
 
Total
Revenue
$
288.9

 
$
299.2

 
$
312.4

 
$
285.3

 
$
1,185.8

Operating income
29.6

 
27.4

 
25.5

 
10.5

 
93.0

Income (loss) from continuing operations
7.0

 
77.6

 
18.8

 
(1.6
)
 
101.8

Income from discontinued operations, net of tax
—

 
—

 
—

 
0.3

 
0.3

Net income (loss)
7.0

 
77.6

 
18.8

 
(1.3
)
 
102.1

 
 
 
 
 
 
 
 
 
 
Basic earnings (loss) per common share from continuing operations
$
0.10

 
$
1.79

 
$
0.39

 
$
(0.10
)
 
$
2.17

Basic earnings per common share from discontinued operations
$
—

 
$
—

 
$
—

 
$
0.01

 
$
0.01

Net basic earnings (loss) per common share
$
0.10

 
$
1.79

 
$
0.39

 
$
(0.09
)
 
$
2.18

 
 
 
 
 
 
 
 
 
 
Diluted earnings (loss) per common share from continuing operations
$
0.10

 
$
1.78

 
$
0.38

 
$
(0.10
)
 
$
2.17

Diluted earnings per common share from discontinued operations
$
—

 
$
—

 
$
—

 
$
0.01

 
$
0.01

Net diluted earnings (loss) per common share
$
0.10

 
$
1.78

 
$
0.38

 
$
(0.09
)
 
$
2.18