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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended			25 Months Ended	72 Months Ended
	Dec. 31, 2022	Oct. 31, 2022	May 31, 2022	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2024	Sep. 28, 2023	Nov. 10, 2022
Revenue, nonmonetary transaction					$ 30.2	$ 14.8	$ 14.5
Deferred revenue, additions in period					16.9	33.4
Deferred revenue, revenue recognized					117.2	23.6
Separative work units borrowed in period, value		$ 10.4	$ 8.5	$ 9.4
Accounts receivable, net					80.0	49.4		$ 80.0	$ 80.0
Revenue, remaining performance obligation, amount					800.0	1,000.0		800.0	800.0
Deferred Revenue and Advances from Customers - Current and Noncurrent					216.4	315.4		216.4	216.4
Contract with Customer, Advances, Liability					32.8	63.0		32.8	32.8
Revenue					442.0	320.2	293.8
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax					(0.2)	0.1	0.1
Phase 2
Contract Estimated Fee					7.7			7.7	7.7
Contract Minimum Fee					6.9			6.9	6.9
HALEU Ops Contract
Cost obligated to DOE								166.6
Total Amount Program Cost								166.9
accrued loss	$ 21.3
Contract Value											$ 150.0
HALEU Ops Contract | Phase 2
Contract Value					129.0			129.0	129.0		90.0
HALEU Ops Contract | Phase Scope
Contract Value					8.5			8.5	8.5	$ 5.8
HALEU Demo Contract
Contract Value					$ 173.0			$ 173.0	$ 173.0
Government cost share, percentage					80.00%			80.00%	80.00%
Revenue									$ 173.0
Maximum [Member] | HALEU Ops Contract | Phase 1
Government cost share portion											30.0
Company cost share portion											$ 30.0
Government [Member] | HALEU Ops Contract
Proceeds from Customers								$ 117.8
Provision for loss on contracts utilized					$ 0.0	20.0	1.3
Government [Member] | HALEU Demo Contract
Proceeds from Customers									171.2
Provision for loss on contracts utilized					0.0	0.0	$ 0.5
Low Enriched Uranium Segment [Member]
Revenue, remaining performance obligation, amount					700.0	1,000.0		700.0	700.0
Technical Solutions Segment [Member]
Revenue, remaining performance obligation, amount					$ 28.0	$ 77.0		$ 28.0	$ 28.0

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