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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Long-term Debt, Unclassified [Abstract]    
Long-term debt $ 75.1 $ 100.0
Long-term debt discount (0.9) (0.9)
Net long-term debt $ 74.2 $ 99.1