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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		39 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Apr. 07, 2022	Dec. 31, 2021
Advances from customers, noncurrent	$ 45.1		$ 45.1		$ 45.1
Deferred revenue, revenue recognized	0.3	$ 28.5
Separative work units owed to others noncurrent	$ 31.8		$ 31.8		22.4
Government cost share, percentage	80.00%		80.00%
Government cost share portion	$ 115.0		$ 115.0
Company cost share portion, percentage	20.00%		20.00%
Provision for Loss on Contracts Utilized	$ (0.5)	(2.0)
Accounts receivable, net	12.5		$ 12.5		29.1
Revenue, remaining performance obligation, amount	1,000.0		1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent	300.0		300.0
Maximum [Member]
Government cost share portion	130.0		130.0
Government [Member]
Provision for Loss on Contracts	0.0		0.0		$ 0.5
Provision for Loss on Contracts Utilized	$ 0.5	$ (2.0)	19.6
Proceeds from Customers			$ 132.3
Forecast [Member]
Government cost share portion, increase				$ 12.0
Forecast [Member] | Maximum [Member]
Government cost share portion				$ 142.0

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Cash receipts from customers during the current period which are usually for sales of goods and services.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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