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Commitment and Contingencies - Future Minimum Lease Payments (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 14.1
2020 14.3
2021 12.3
2022 9.6
2023 8.3
Thereafter 25.3
Total $ 83.9