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Leases - Schedule of Maturities of Lease Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Finance Lease Liabilities, Payments, Due [Abstract]      
2020 $ 1.2    
2021 1.5    
2022 1.1    
2023 0.6    
2024 0.1    
Total lease payments 4.5    
Less: imputed interest (0.5)    
Total future lease obligation 4.0 $ 4.2 $ 4.5
Operating Lease Liabilities, Payments Due [Abstract]      
2020 8.4    
2021 9.6    
2022 8.2    
2023 6.8    
2024 4.3    
Thereafter 9.0    
Total lease payments 46.3    
Less: imputed interest (7.4)    
Total future lease obligation $ 38.9 $ 41.3 $ 35.7