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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue, nonmonetary transaction	$ 23.4
Nonmonetary transaction, amount of barter transaction	29.4
Separative work units owed to others noncurrent	10.8
Government cost obligation	53.2
Loss on contracts		$ 0.0
Provision for Loss on Contracts	15.3
Accounts receivable, net	17.5		$ 21.1
Minimum [Member]
Company cost share portion			18.3
Maximum [Member]
Government cost share portion	115.0
Government [Member]
Provision for Loss on Contracts	9.7		$ 10.0
Proceeds from Customers	$ 19.0

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period.

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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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