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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 42.0 $ 44.4
Accrued taxes payable 3.2 7.1
Other 15.6 14.1
Total accrued liabilities $ 60.8 $ 65.6