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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 49.5 $ 44.4
Accrued taxes payable 4.3 7.1
Other 14.5 14.1
Total accrued liabilities $ 68.3 $ 65.6