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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Payables And Accruals [Abstract]    
Employee compensation and benefits $ 49.3 $ 37.3
Accrued taxes payable 3.0 2.8
Other 11.7 9.4
Total accrued liabilities $ 64.0 $ 49.5