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Leases - Schedule of Components of Leases and Lease Costs (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Leases [Abstract]    
Operating lease right-of-use assets $ 37.2 $ 21.0
Operating Lease, Liability, Current us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityCurrent
Operating lease liabilities $ 10.5 $ 6.5
Operating Lease, Liability, Noncurrent us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Operating lease liabilities, long-term $ 28.9 $ 14.6
Operating Lease, Liability us-gaap:OperatingLeaseLiability us-gaap:OperatingLeaseLiability
Total operating lease liabilities $ 39.4 $ 21.1