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Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Total Revenue $ 136.5 $ 21.4 $ 63.4 $ 90.0 $ 157.9 $ 29.2 $ 63.3 $ 167.8 $ 311.3 $ 418.2
Cost of sales 110.6 23.5 57.9 74.2 75.8 53.6 59.0 160.9 266.2 349.3
Gross profit (loss) 25.9 (2.1) 5.5 15.8 82.1 (24.4) 4.3 6.9 45.1 68.9
Advanced technology costs 9.3 21.9 4.7 12.0 25.3 1.9 4.0 1.8 47.9 33.0
Selling, general and administrative 11.6 10.7 12.5 11.4 10.5 13.5 6.3 12.3 46.2 42.6
Amortization of intangible assets 4.9 1.7 2.7 3.2 6.3 1.1 2.0 4.0 12.5 13.4
Impairment of excess reorganization value                 0.0 137.2
Special charges for workforce reductions 0.2 0.6 0.6 0.0 (0.1) 9.8 2.9 0.6 1.4 13.2
Gains on sales of assets (0.2) (0.3) (0.4) (0.3) (0.3) (0.3) (0.7) (0.8) (1.2) (2.1)
Operating (loss) 0.1 (36.7) (14.6) (10.5) (96.8) (50.4) (10.2) (11.0) (61.7) (168.4)
Gain on early extinguishment of debt and debt restructuring costs 3.7   (16.7)           (13.0)  
Gain on early extinguishment of debt and debt restructuring costs                 (16.7) 0.0
Interest expense 4.9 4.7 5.1 5.0 5.0 4.8 4.9 4.9 19.7 19.6
Investment income (0.3) (0.1) (0.1) (0.3) 0.0 (0.1) 0.0 (0.2) (0.8) (0.3)
Provision (benefit) for income taxes 0.0 0.0 0.0 (0.6) 0.0 0.0 0.0 (0.3) (0.6) (0.3)
Net income (loss) $ (8.2) $ (41.3) $ (2.9) $ (14.6) $ (101.8) $ (55.1) $ (15.1) $ (15.4) $ (67.0) $ (187.4)
Net loss per share - basic and diluted $ (0.90) $ (4.54) $ (0.32) $ (1.60) $ (11.19) $ (6.05) $ (1.68) $ (1.71) $ (7.36) $ (20.82)