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Commitments and Contingencies - Liabilities of Discontinued Operations (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]    
Environmental remediation reserve $ 0.3 $ 0.4
Estimated product liability obligations of the discontinued North American refuse truck body business $ 1.1 $ 1.1