Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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- References

No definition available.

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Revenues [Abstract]
Total Revenue					$ 123.6				$ 390.5	$ 418.2	$ 514.1
Gross Profit											(41.3)
Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods											449.3
Gross Profit											(39.7)
Contract Services Segment [Member]
Revenues [Abstract]
Revenue, Contract Services											64.8
Gross Profit											(1.6)
Separative Work Units [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods											448.5
Uranium [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods											$ 0.8
Successor [Member]
Revenues [Abstract]
Revenue, Contract Services					21.8
Total Revenue	$ 157.9	$ 29.2	$ 63.3	$ 167.8	123.6					418.2
Gross Profit	$ 82.1	$ (24.4)	$ 4.3	$ 6.9	(18.5)					68.9
Successor [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods					101.8					355.4
Gross Profit					(17.8)					70.1
Successor [Member] \| Contract Services Segment [Member]
Revenues [Abstract]
Revenue, Contract Services					21.8					62.8
Gross Profit					(0.7)					(1.2)
Successor [Member] \| Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods					101.0
Successor [Member] \| Separative Work Units [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods					101.0					289.9
Successor [Member] \| Uranium [Member]
Revenues [Abstract]
Revenue, Goods					0.8
Successor [Member] \| Uranium [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods					$ 0.8					$ 65.5
Predecessor [Member]
Revenues [Abstract]
Revenue, Contract Services									43.0
Total Revenue						$ 120.7	$ 121.2	$ 148.6	390.5
Gross Profit						$ (5.4)	$ 3.5	$ (20.9)	(22.8)
Predecessor [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods									347.5
Gross Profit									(21.9)
Predecessor [Member] \| Contract Services Segment [Member]
Revenues [Abstract]
Revenue, Contract Services									43.0
Gross Profit									(0.9)
Predecessor [Member] \| Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods									347.5
Predecessor [Member] \| Separative Work Units [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods									347.5
Predecessor [Member] \| Uranium [Member]
Revenues [Abstract]
Revenue, Goods									0.0
Predecessor [Member] \| Uranium [Member] \| Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods									$ 0.0