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Other Accrued Liabilities and Other Long-Term Liabilities - Other Long-Term Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Payables And Accruals [Abstract]    
Income taxes payable, long-term $ 16.4 $ 16.2
Operating lease liabilities, long-term 17.8  
Other 15.0 14.1
Other long-term liabilities $ 49.2 $ 30.3