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Other Accrued Liabilities and Other Long-Term Liabilities - Other Long-Term Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Payables And Accruals [Abstract]    
Operating lease liabilities, long-term $ 28.9 $ 14.6
Deferred tax liability 23.9  
Income taxes payable, long-term 16.0 16.4
Other 13.8 13.0
Other long-term liabilities $ 82.6 $ 44.0