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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Jun. 30, 2019
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 55.3 $ 48.8
Accrued taxes payable 3.5 3.0
Qui tam settlement   9.1
Other 4.3 18.0
Total accrued liabilities $ 63.1 $ 78.9