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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 47.8 $ 49.5
Accrued taxes payable 9.8 4.3
Other 18.8 14.5
Total accrued liabilities $ 76.4 $ 68.3