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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended				37 Months Ended	38 Months Ended	72 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2025	Feb. 11, 2026	Dec. 31, 2024	Jan. 05, 2026	Sep. 28, 2023	Nov. 10, 2022
Revenue, nonmonetary transaction	$ 32.8	$ 30.2	$ 14.8
Deferred revenue, additions in period	17.3	16.9
Deferred revenue, revenue recognized	102.6	117.2
Separative work units borrowed in period, value				$ 28.3
Accounts receivable, net	30.7	80.0			$ 30.7		$ 80.0
Revenue, remaining performance obligation, amount	600.0	800.0			600.0		800.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	131.1	216.4			131.1		216.4
Contract with Customer, Advances, Liability	0.0	32.8			0.0		32.8
Revenue	448.7	442.0	320.2
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax	0.1	(0.2)	$ 0.1
Option 1a
Contract Value	108.2				108.2
Contract Estimated Fee	8.7				8.7
Contract Minimum Fee	99.3				99.3
Option 1b
Contract Estimated Fee	15.2				15.2
Contract Minimum Fee	163.5				163.5
HALEU Ops Contract
Cost obligated to DOE					316.2
Total Amount Program Cost					316.6
Contract Value										$ 150.0
HALEU Ops Contract \| Phase Scope
Contract Value	8.8				8.8				$ 5.8
HALEU Demo Contract
Contract Value	$ 173.0				$ 173.0
Government cost share, percentage	80.00%				80.00%
HALEU Demo Contract \| Subsequent Event
Contract Value								$ 170.0
Contract Value, Award Task								$ 900.0
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					$ 225.3
Government [Member] \| HALEU Demo Contract
Proceeds from Customers							171.2
Low Enriched Uranium Segment [Member]
Revenue, remaining performance obligation, amount	$ 600.0	700.0			600.0		700.0
Technical Solutions Segment [Member]
Revenue, remaining performance obligation, amount	$ 79.1	$ 28.0			$ 79.1		$ 28.0
Scenario, Forecast [Member] \| HALEU Ops Contract
Cost obligated to DOE						$ 317.0
Total Amount Program Cost						317.4
Scenario, Forecast [Member] \| HALEU Ops Contract \| Phase Scope
Contract Value						$ 9.7