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Multiemployer plan (Details 2) - Multiemployer plans, pension [Member] - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2015
Multiemployer Plans [Line Items] |  |
Additional multiemployer plan withdrawal obligation | $ 2.4 |
Multiemployer plans, withdrawal obligation |  | $ 16.4

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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