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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	51 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized	$ (5.6)	$ (0.5)
Deferred revenue, revenue recognized	0.0	0.3
Revenue, remaining performance obligation, amount	1,000.0		$ 1,000.0	$ 1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	$ 320.0		$ 320.0	$ 320.0	$ 319.0
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			$ 33.0
Total Amount Program Cost			120.1
Contract Value	$ 150.0		150.0	$ 150.0
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]
Provision for Loss on Contracts	14.5		14.5	14.5	$ 20.0
Proceeds from Customers			4.1	171.1
Government [Member] \| HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized	0.0	$ (0.5)		19.6
Provision for Loss on Contracts	0.0		0.0	0.0
Government [Member] \| HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized	5.5		6.8
Provision for Loss on Contracts	14.5		14.5	14.5
Maximum [Member] \| HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share portion	173.0		173.0	173.0
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