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Commitments and Contingencies - Aggregate Minimum Rental Commitments for Non-Cancelable Operating Leases (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 6.0
2020 3.6
2021 1.6
2022 0.4
2023 0.3
Thereafter 0.1
Total minimum operating lease payments $ 12.0