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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Advances from customers, noncurrent	$ 29.4	$ 14.5	$ 29.4	$ 15.0
Separative work units owed to others noncurrent	7.3		7.3
Government cost share portion	115.0		115.0
Company cost share portion	29.0		29.0
Government cost obligation	18.6		18.6
Government spending authorization	6.4		6.4
Loss on contracts	0.5		0.5
Accounts receivable, net	30.2		30.2	60.2
Government [Member]
Proceeds from Customers		4.7
Advances from customers				19.3
Gain (loss) related to litigation settlement		$ 9.5
Low Enriched Uranium Segment [Member]
Revenue, remaining performance obligation, amount	$ 1,100.0		$ 1,100.0	$ 1,000.0

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- Definition

Anticipated company cost share portion of new government contract

+ References

No definition available.

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- Definition

Government cost obligation on contract

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Government spending authorization on contract

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- Definition

Separative work units owed to others noncurrent

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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The current portion of prepayments received from customers for goods or services to be provided in the future.

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-SubTopic 10
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-Paragraph 1
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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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-SubTopic 10
-Section 45
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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 450
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-Section 50
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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
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-URI http://asc.fasb.org/extlink&oid=68068069&loc=d3e57763-111642

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 45
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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
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