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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	9 Months Ended		31 Months Ended	78 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Jun. 30, 2025	Jun. 17, 2025	Dec. 31, 2024	Nov. 05, 2024	Nov. 01, 2023	Sep. 28, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share, percentage	80.00%
Deferred revenue, revenue recognized	$ 68.5	$ 99.6
Revenue, remaining performance obligation, amount	700.0					$ 800.0
LEU Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	600.0					700.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	154.8					216.4
Technical Solutions Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	98.7					$ 28.0
Phase 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value								$ 90.0
Option 1a
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value	108.2
Contract Minimum Fee					$ 99.3
Contract Estimated Fee					8.7
Option 1b
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Minimum Fee					163.5
Contract Estimated Fee					$ 15.2
HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost obligated to DOE			$ 316.2
Contract Value	150.0
HALEU Ops Contract | Phase 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value							$ 170.1
HALEU Ops Contract | Phase Scope
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value	8.8								$ 5.8
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers				$ 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]
Proceeds from Customers			$ 195.4
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
-SubTopic 20
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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