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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Jun. 30, 2015
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 34.4 $ 33.8
Accrued taxes payable 4.7 3.8
Other 8.8 8.5
Total Accrued liabilities $ 47.9 $ 46.1