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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 29.9 $ 33.8
Accrued taxes payable 4.0 3.8
Other 7.9 8.5
Total accrued liabilities $ 41.8 $ 46.1