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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended	16 Months Ended	63 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized	$ 0.0	$ (5.6)
Deferred revenue, revenue recognized	0.0
Revenue, remaining performance obligation, amount	1,000.0			$ 1,000.0	$ 1,000.0	$ 1,000.0
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax	0.1	0.0
Accrued loss			$ 21.3
LEU Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	1,000.0			1,000.0	1,000.0	1,000.0
SWU Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	315.0			315.0	315.0	315.0
Technical Solutions Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	$ 58.0			$ 58.0	$ 58.0	77.0
HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share, percentage	80.00%			80.00%	80.00%
HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cost obligated to DOE				$ 73.9
Total Amount Program Cost				125.9
Contract Value	$ 150.0			150.0	$ 150.0
New Amount Program Cost				5.8
HALEU Ops Contract | Phase 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract Value	90.0			90.0	90.0
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers				55.2	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	0.0	$ 5.5
Provision for Loss on Contracts	0.0			0.0	0.0	$ 0.0
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
Company cost share portion	$ 30.0			$ 30.0	$ 30.0

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