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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		19 Months Ended	66 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized				$ 0.0	$ (11.3)
Deferred revenue, revenue recognized				64.7	14.8
Revenue, remaining performance obligation, amount	$ 900.0			900.0		$ 900.0	$ 900.0	$ 1,000.0
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax	0.0	$ 0.0		(0.1)	0.0
Accrued loss			$ 21.3
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	257.0			257.0		257.0	257.0	315.0
Technical Solutions Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, amount	$ 38.9			$ 38.9		$ 38.9	$ 38.9	$ 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						$ 89.1
Total Amount Program Cost						125.9
Contract Value	$ 150.0			$ 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	90.0
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from Customers						76.4	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		$ 5.8			$ 11.3
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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