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Commitment and Contingencies (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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CFCAA funding threshold related to liability under ERISA | 90.00% |
Decontamination and decommissioning obligations | $ 29.4 | $ 29.4
D&D financial assurance | $ 29.4 | $ 29.4

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- Definition ARO financial assurance + References No definition available. + Details
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- Definition CFCAA funding threshold related to liability under ERISA + References No definition available. + Details
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- Definition Current portion of 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 + Details
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