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Leases - Schedule of Future Minimum Lease Payments Required under Noncancelable Operating Leases (Detail)
$ in Millions
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2020 $ 15.1
2021 14.1
2022 13.1
2023 12.2
2024 11.9
Thereafter 19.1
Total $ 85.5