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Commitments and Contingencies - Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]    
Environmental remediation reserve $ 0.4 $ 0.5
Estimated product liability obligations of the discontinued North American refuse truck body business $ 1.4 $ 1.4