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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Long-term Debt, Unclassified [Abstract]    
Long-term debt $ 226.7 $ 235.0
Long-term debt discount (2.3) (1.5)
Net long-term debt $ 224.4 $ 233.5