CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue from Contract with Customer, Excluding Assessed Tax	$ 154.5	$ 189.0	$ 227.6	$ 232.7
Cost of sales	100.6	152.5	140.8	191.9
Gross profit (loss)	53.9	36.5	86.8	40.8
Advanced technology license and decommissioning costs	3.3	4.1	6.3	9.8
Selling, general and administrative	9.2	7.1	17.0	15.0
Labor and Related Expense	4.2	0.5	4.7	0.7
Amortization of intangible assets	3.7	3.7	4.8	4.8
Operating income (loss)	33.5	21.1	54.0	10.5
Nonoperating components of net periodic benefit expense (income)	1.0	(16.3)	1.9	(16.2)
Interest expense	3.1	0.3	6.5	0.7
Investment income	(8.0)	(2.4)	(15.3)	(5.2)
Gain (Loss) on Extinguishment of Debt	0.0	0.0	(11.8)	0.0
Other Nonoperating Income	0.0	0.0	0.1	0.1
Income (loss) before income taxes	37.4	39.5	72.6	31.1
Provision (benefit) for income taxes	8.5	8.9	16.5	6.6
Net income (loss)	$ 28.9	$ 30.6	$ 56.1	$ 24.5
Net income (loss) per common share - basic	$ 1.63	$ 1.89	$ 3.23	$ 1.53
Net income (loss) per common share - diluted	$ 1.59	$ 1.89	$ 3.22	$ 1.52
Weighted-average number of shares outstanding:
Average number of shares outstanding, basic	17,703	16,185	17,344	16,045
Average number of shares outstanding, diluted	18,121	16,226	17,406	16,125
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 125.7	$ 169.6	$ 177.0	$ 193.2
Cost of sales	75.0	136.6	95.1	159.7
Uranium [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	29.9	0.0	29.9
Separative Work Units [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	125.7	139.7	177.0	163.3
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	28.8	19.4	50.6	39.5
Cost of sales	25.6	15.9	45.7	32.2
Gross profit (loss)	$ 3.2	$ 3.5	$ 4.9	$ 7.3