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Quarterly Results of Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Results of Operations (Unaudited) [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
2017
 
1st Qtr.
 
2nd Qtr.
 
3rd Qtr.
 
4th Qtr.
 
Year
 
 
 
 
 
 
 
 
 
 
Revenue
$
7.2

 
$
44.0

 
$
50.3

 
$
116.9

 
$
218.4

Cost of sales
9.7

 
48.3

 
38.7

 
64.9

 
161.6

Gross profit (loss)
(2.5
)
 
(4.3
)
 
11.6

 
52.0

 
56.8

Advanced technology license and decommissioning costs
6.1

 
4.4

 
4.5

 
0.7

 
15.7

Selling, general and administrative
12.4

 
9.7

 
11.0

 
10.0

 
43.1

Amortization of intangible assets
1.2

 
2.0

 
2.5

 
4.9

 
10.6

Special charges for workforce reductions and advisory costs
2.4

 
2.3

 
2.4

 
2.4

 
9.5

Gains on sales of assets
(1.0
)
 
(0.7
)
 
(0.6
)
 
(2.3
)
 
(4.6
)
Operating income (loss)
(23.6
)
 
(22.0
)
 
(8.2
)
 
36.3

 
(17.5
)
Gain on early extinguishment of debt
(33.6
)
 
—

 
—

 
—

 
(33.6
)
Interest expense
2.9

 
0.7

 
0.7

 
1.0

 
5.3

Investment income
(0.3
)
 
(0.3
)
 
(0.4
)
 
(0.3
)
 
(1.3
)
Income tax benefit (expense)
(0.2
)
 
—

 


 
0.1

 
(0.1
)
Net income (loss)
$
7.6

 
$
(22.4
)
 
$
(8.5
)
 
$
35.5

 
$
12.2

Preferred stock dividends - undeclared and cumulative
1.0

 
2.0

 
2.0

 
1.9

 
6.9

Net income (loss) allocable to common stockholders
$
6.6

 
$
(24.4
)
 
$
(10.5
)
 
$
33.6

 
$
5.3

 
 
 
 
 
 
 
 
 
 
Net income (loss) per share:
 
 
 
 
 
 
 
 
 
Basic
$
0.73

 
$
(2.69
)
 
$
(1.15
)
 
$
3.69

 
$
0.58

Diluted
$
0.72

 
$
(2.69
)
 
$
(1.15
)
 
$
3.69

 
$
0.58

 
2016
 
1st Qtr.
 
2nd Qtr.
 
3rd Qtr.
 
4th Qtr.
 
Year
 
 
 
 
 
 
 
 
 
 
Revenue
$
90.0

 
$
63.4

 
$
21.4

 
$
136.5

 
$
311.3

Cost of sales
74.2

 
57.9

 
23.5

 
110.6

 
266.2

Gross profit (loss)
15.8

 
5.5

 
(2.1
)
 
25.9

 
45.1

Advanced technology license and decommissioning costs
12.0

 
4.7

 
21.9

 
9.3

 
47.9

Selling, general and administrative
11.4

 
12.5

 
10.7

 
11.6

 
46.2

Amortization of intangible assets
3.2

 
2.7

 
1.7

 
4.9

 
12.5

Special charges for workforce reductions
—

 
0.6

 
0.6

 
0.2

 
1.4

Gains on sales of assets
(0.3
)
 
(0.4
)
 
(0.3
)
 
(0.2
)
 
(1.2
)
Operating income (loss)
(10.5
)
 
(14.6
)
 
(36.7
)
 
0.1

 
(61.7
)
Gain on early extinguishment of debt and debt restructuring costs
—

 
(16.7
)
 
—

 
3.7

 
(13.0
)
Interest expense
5.0

 
5.1

 
4.7

 
4.9

 
19.7

Investment income
(0.3
)
 
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.8
)
Income tax benefit
(0.6
)
 
—

 
—

 
—

 
(0.6
)
Net loss
$
(14.6
)
 
$
(2.9
)
 
$
(41.3
)
 
$
(8.2
)
 
$
(67.0
)
Preferred stock dividends - undeclared and cumulative
—

 
—

 
—

 
—

 
—

Net loss allocable to common stockholders
$
(14.6
)
 
$
(2.9
)
 
$
(41.3
)
 
$
(8.2
)
 
$
(67.0
)
 
 
 
 
 
 
 
 
 
 
Net loss per share - basic and diluted
$
(1.60
)
 
$
(0.32
)
 
$
(4.54
)
 
$
(0.90
)
 
$
(7.36
)