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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		7 Months Ended	54 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized		$ (11.3)	$ (0.5)
Deferred revenue, revenue recognized		14.8	59.7
Revenue, remaining performance obligation, amount	$ 1,000.0	1,000.0		$ 1,000.0	$ 1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	$ 328.0	$ 328.0		$ 328.0	$ 328.0	$ 319.0
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				$ 33.0
Total Amount Program Cost				120.1
Contract Value	$ 150.0	$ 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	90.0
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts	8.7	8.7		8.7	8.7	$ 20.0
Proceeds from Customers				13.2	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	0.0
Government [Member] \| HALEU Ops Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loss on Contracts Utilized	5.8	11.3		12.6
Provision for Loss on Contracts	8.7	8.7		8.7	8.7
Maximum [Member] \| HALEU Demo Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Government cost share portion	173.0	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	30.0
Company cost share portion	$ 30.0	$ 30.0		$ 30.0	$ 30.0