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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended	22 Months Ended	69 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized			$ 0.0	$ (16.7)
Deferred revenue, revenue recognized			99.6	23.6
Revenue, remaining performance obligation, amount	$ 800.0		800.0			$ 800.0	$ 800.0	$ 1,000.0
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax	(0.1)	$ 0.6		0.6
Accrued loss					$ 21.3
Contract Minimum Fee	6.9		6.9			6.9	6.9
LEU Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	800.0		800.0			800.0	800.0	1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	223.0		223.0			223.0	223.0	315.0
Technical Solutions Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	$ 18.0		$ 18.0			$ 18.0	$ 18.0	$ 77.0
HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share, percentage	80.00%		80.00%			80.00%	80.00%
HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost obligated to DOE						$ 118.4
Total Amount Program Cost						126.3
Contract Value	$ 150.0		$ 150.0			150.0	$ 150.0
New Amount Program Cost						6.2
HALEU Ops Contract | Phase 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value	90.0		90.0			90.0	90.0
Contract Estimated Value	7.5		7.5			7.5	7.5
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers						95.2	173.0
Government [Member] | HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers							171.2
Government [Member] | HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized		$ 5.4		$ 16.7
Maximum [Member] | HALEU Ops Contract | Phase 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share portion	30.0		30.0			30.0	30.0
Company cost share portion	$ 30.0		$ 30.0			$ 30.0	$ 30.0

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