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Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Total Revenue $ 116.9 $ 50.3 $ 44.0 $ 7.2 $ 136.5 $ 21.4 $ 63.4 $ 90.0 $ 218.4 $ 311.3
Cost of sales 64.9 38.7 48.3 9.7 110.6 23.5 57.9 74.2 161.6 266.2
Gross profit (loss) 52.0 11.6 (4.3) (2.5) 25.9 (2.1) 5.5 15.8 56.8 45.1
Advanced technology costs 0.7 4.5 4.4 6.1 9.3 21.9 4.7 12.0 15.7 47.9
Selling, general and administrative 10.0 11.0 9.7 12.4 11.6 10.7 12.5 11.4 43.1 46.2
Amortization of intangible assets 4.9 2.5 2.0 1.2 4.9 1.7 2.7 3.2 10.6 12.5
Special charges for workforce reductions 2.4 2.4 2.3 2.4 0.2 0.6 0.6 0.0 9.5 1.4
Gains on sales of assets (2.3) (0.6) (0.7) (1.0) (0.2) (0.3) (0.4) (0.3) (4.6) (1.2)
Operating income (loss) 36.3 (8.2) (22.0) (23.6) 0.1 (36.7) (14.6) (10.5) (17.5) (61.7)
Gain on early extinguishment of debt and debt restructuring costs 0.0 0.0 0.0 (33.6) 3.7 0.0 (16.7) 0.0 (33.6) (13.0)
Gain on early extinguishment of debt and debt restructuring costs       (33.6)         (33.6) (16.7)
Interest expense 1.0 0.7 0.7 2.9 4.9 4.7 5.1 5.0 5.3 19.7
Investment income (0.3) (0.4) (0.3) (0.3) (0.3) (0.1) (0.1) (0.3) (1.3) (0.8)
Provision (benefit) for income taxes 0.1 0.0 (0.2) 0.0 0.0 0.0 (0.6) (0.1) (0.6)
Net income (loss) 35.5 (8.5) (22.4) 7.6 (8.2) (41.3) (2.9) (14.6) 12.2 (67.0)
Preferred stock dividends, undeclared and cumulative 1.9 2.0 2.0 1.0         6.9  
Net income (loss) allocable to common stockholders $ 33.6 $ (10.5) $ (24.4) $ 6.6 $ (8.2) $ (41.3) $ (2.9) $ (14.6) $ 5.3 $ (67.0)
Net income (loss) per share, basic $ 3.69 $ (1.15) $ (2.69) $ 0.73         $ 0.58  
Net income (loss) per share, diluted $ 3.69 $ (1.15) $ (2.69) $ 0.72         0.58  
Net income (loss) per share - basic and diluted         $ (0.90) $ (4.54) $ (0.32) $ (1.60) $ 0.58 $ (7.36)