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Segment Information Schedule Of Entity Wide Revenue By Major Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Customer A [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 2.6
Customer A [Member] | Contract Services Segment [Member]
Revenue, Major Customer [Line Items]
Revenue			$ 8.7	$ 9.9
Customer B [Member] | Contract Services Segment [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 6.3
Customer C [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue		$ 18.6	$ 35.0	30.7
Customer D [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue		14.3		14.4
Customer E [Member] | Contract Services Segment [Member]
Revenue, Major Customer [Line Items]
Revenue		$ 4.5		$ 9.2

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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