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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		22 Months Ended	69 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2024	Nov. 05, 2024	Nov. 01, 2023	Sep. 28, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred revenue, revenue recognized	$ 0.0	$ 0.0
Revenue, remaining performance obligation, amount	700.0				$ 800.0
LEU Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	700.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	216.5				216.4
Technical Solutions Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	23.4				$ 28.0
Phase 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Minimum Fee	6.9
Contract Estimated Fee	$ 7.7
HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share, percentage	80.00%
HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost obligated to DOE			$ 189.8
Total Amount Program Cost			190.2
Contract Value	$ 150.0
HALEU Ops Contract | Phase 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value						$ 152.3	$ 90.0
HALEU Ops Contract | Phase Scope
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value	8.5							$ 5.8
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers			$ 145.8	$ 173.0
Government [Member] | HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers				$ 171.2
Maximum [Member] | HALEU Ops Contract | Phase 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share portion	30.0
Company cost share portion	$ 30.0

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Topic 606
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