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Commitments and Contingencies - Narrative (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
Facility
Commitments And Contingencies Disclosure [Abstract]      
Number of sites cited as potentially responsible party     2
Number of previously and currently owned sites with potential remediation obligations     6
Rend expense for facilities in use and equipment | $ $ 26.3 $ 83.7