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Leases - Schedule of Future Minimum Lease Payments for Operating Leases (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Leases [Abstract]      
Remainder of 2020 $ 2.3    
2021 7.9    
2022 7.2    
2023 4.0    
2024 2.4    
Thereafter 1.9    
Total 25.7    
Less: interest (1.9)    
Total lease liabilities $ 23.8   $ 28.4
Total   $ 11.9