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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Long-term Debt, Unclassified [Abstract]    
Long-term debt $ 226.6 $ 235.0
Long-term debt discount (1.5) (1.5)
Net long-term debt $ 225.1 $ 233.5