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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from Contract with Customer, Excluding Assessed Tax	$ 10.6	$ 39.4	$ 49.3	$ 75.1
Revenue	10.6	39.4	49.3	75.1
Cost of sales	14.9	50.1	59.1	91.1
Gross profit (loss)	(4.3)	(10.7)	(9.8)	(16.0)
Advanced technology license and decommissioning costs	5.1	5.4	11.7	13.4
Selling, general and administrative	7.7	9.7	15.8	20.9
Amortization of intangible assets	1.2	1.5	2.3	2.8
Special charges for workforce reductions and advisory costs	(2.9)	0.3	(3.0)	0.9
Other (income)	(0.1)	(0.2)	(0.5)	(0.3)
Operating (loss)	(15.3)	(27.4)	(36.1)	(53.7)
Nonoperating components of net periodic benefit expense (income)	0.0	(1.7)	(0.1)	(3.3)
Interest expense	1.0	1.0	2.0	2.0
Investment income	(0.7)	(0.6)	(1.4)	(1.2)
Income (loss) before income taxes	(15.6)	(26.1)	(36.6)	(51.2)
Provision (benefit) for income taxes	0.0	0.0	(0.1)	(0.1)
Net income (loss)	(15.6)	(26.1)	(36.5)	(51.1)
Preferred stock dividends, undeclared and cumulative	2.0	2.0	4.0	4.0
Net income (loss) allocable to common stockholders	$ (17.6)	$ (28.1)	$ (40.5)	$ (55.1)
Net loss per share - basic and diluted	$ (1.84)	$ (3.08)	$ (4.24)	$ (6.05)
Weighted-average number of shares outstanding:
Average number of common shares outstanding, basic and diluted	9,565	9,118	9,549	9,111
Weighted Average Number of Shares Outstanding, Diluted	9,565	9,118	9,549	9,111
Separative Work Units [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0.0	$ 32.9	$ 12.4	$ 50.6
Uranium [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2.6	0.0	25.3	3.6
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2.6	32.9	37.7	54.2
Cost of sales	7.7	42.9	46.0	77.7
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	8.0	6.5	11.6	20.9
Cost of sales	$ 7.2	$ 7.2	$ 13.1	$ 13.4

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