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Contract Services and Advanced Technology License and Decommissioning Costs (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Contract revenue current work |  | $ 30.4 |  |  |
Contract revenue past work |  | 8.1 |  |  |
D&D Expense |  | 19.0 |  | $ 7.0 |
Decontamination and decommissioning obligations - total |  | $ 38.6 |  |  |
2017 ORNL Contract [Member] | Scenario, Forecast [Member] |  |  |  |  |
Contract value | $ 25.0 |  |  |  |
Contract monthly revenue | 2.0 |  |  |  |
Contract milestone payments | $ 1.0 |  |  |  |
2016 ORNL Contract [Member] |  |  |  |  |
Contract monthly revenue |  |  | $ 2.7 |  |
2015 ORNL Contract [Member] |  |  |  |  |
Contract monthly revenue |  |  |  |  | $ 6.9

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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