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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Long-term Debt, Unclassified [Abstract]    
Long-term debt $ 260.1 $ 10.0
Long-term debt discount (2.1) (0.7)
Net long-term debt $ 258.0 $ 9.3