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Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Revenue $ 92.9 $ 33.6 $ 75.7 $ 45.0 $ 55.7 $ 104.7 $ 10.6 $ 38.7 $ 247.2 $ 209.7
Cost of sales 57.9 34.4 31.9 25.4 48.9 69.2 14.9 44.2 149.6 177.2
Gross profit (loss) 35.0 (0.8) 43.8 19.6 6.8 35.5 (4.3) (5.5) 97.6 32.5
Advanced technology license and decommissioning costs 1.0 0.2 0.7 0.9 1.6 1.3 5.1 6.6 2.8 14.6
Selling, general and administrative 10.4 6.7 10.4 8.5 9.2 8.7 7.7 8.1 36.0 33.7
Amortization of intangible assets 2.5 1.2 1.7 1.4 2.4 1.8 1.2 1.1 6.8 6.5
Special charges for workforce reductions and advisory costs 0.1 0.6 0.0 (0.1) 0.3 0.8 (2.9) (0.1) 0.6 (1.9)
Other (income) 0.4 0.0 0.0 0.0 0.0 (0.2) (0.1) (0.4) 0.4 (0.7)
Operating income (loss) 20.6 (9.5) 31.0 8.9 (6.7) 23.1 (15.3) (20.8) 51.0 (19.7)
Nonoperating components of net periodic benefit expense (income) 5.0 (2.2) (2.2) (2.2) (4.1) (0.1) 0.0 (0.1) (1.6) (4.3)
Interest expense 0.0 0.0 0.0 0.1 0.1 0.9 1.0 1.0 0.1 3.0
Investment income 0.0 (0.1) 0.0 (0.4) (0.3) (0.5) (0.7) (0.7) (0.5) (2.2)
Provision (benefit) for income taxes (0.8) (0.2) (0.5) 0.1 0.4 0.0 0.0 (0.1) (1.4) 0.3
Net income (loss) 16.4 (7.0) 33.7 11.3 (2.8) 22.8 (15.6) (20.9) 54.4 (16.5)
Preferred stock dividends, undeclared and cumulative 0.8 1.9 2.0 2.0 1.9 1.9 2.0 2.0 6.7 7.8
Preferred Stock Dividends and Other Adjustments 41.9 0.0 0.0 0.0         41.9 0.0
Net income (loss) allocable to common stockholders $ (26.3) $ (8.9) $ 31.7 $ 9.3 $ (4.7) $ 20.9 $ (17.6) $ (22.9) $ 5.8 $ (24.3)
Net income (loss) per common share - basic $ (2.55) $ (0.83) $ 3.28 $ 0.97 $ (0.49) $ 2.18 $ (1.84) $ (2.40) $ 0.59 $ (2.54)
Net income (loss) per common share - diluted $ (2.55) $ (0.83) $ 3.19 $ 0.95 $ (0.49) $ 2.17 $ (1.84) $ (2.40) $ 0.57 $ (2.54)