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Leases - Schedule of Maturities of Lease Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Finance Lease Liabilities, Payments, Due [Abstract]      
2020 $ 0.4    
2021 1.6    
2022 1.2    
2023 0.7    
2024 0.3    
Thereafter 0.1    
Total lease payments 4.3    
Less: imputed interest (0.6)    
Total future lease obligation 3.7 $ 4.2 $ 4.3
Operating Lease Liabilities, Payments Due [Abstract]      
2020 3.3    
2021 10.8    
2022 8.5    
2023 7.0    
2024 4.3    
Thereafter 9.0    
Total lease payments 42.9    
Less: imputed interest (6.3)    
Total future lease obligation $ 36.6 $ 41.3 $ 40.1