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Product Warranties - Narratives (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018 | Apr. 23, 2018
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Product warranties |  |  |
Guarantor Obligations |  |  |
Warranty accrual | $ 0.6 | $ 3.8 | $ 3.8

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- Definition Amount of loss contingency liability. + 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=82911808&loc=d3e14326-108349 + Details
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