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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)

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