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Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Disclosure Other Non Current Assets Schedule Of Other Non Current Assets [Abstract]    
Pension asset $ 1.4 $ 0.8
Deferred financing costs, net 0.8 0.9
Other 1.9 1.9
Total $ 4.1 $ 3.6