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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Jun. 30, 2016
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 41.0 $ 37.3
Accrued taxes payable 3.0 2.8
Other 13.7 9.4
Total accrued liabilities $ 57.7 $ 49.5