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Other Accrued Liabilities and Other Long-Term Liabilities - Other Long-Term Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Payables And Accruals [Abstract]    
Income taxes payable, long-term $ 17.1 $ 16.2
Operating lease liabilities, long-term 16.8  
Other 15.1 14.1
Other long-term liabilities $ 49.0 $ 30.3