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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 45.2 $ 48.8
Accrued taxes payable 7.2 3.0
Qui tam settlement 9.1 9.1
Other 11.5 18.0
Total accrued liabilities $ 73.0 $ 78.9