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Leases - Schedule of Maturities of Lease Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Finance Lease Liabilities, Payments, Due [Abstract]      
2021 $ 0.8    
2022 1.3    
2023 1.0    
2024 0.5    
2025 0.2    
Thereafter 0.2    
Total lease payments 4.0    
Less: imputed interest (0.4)    
Total future lease obligation 3.6 $ 3.3 $ 3.7
Operating Lease Liabilities, Payments Due [Abstract]      
2021 5.7    
2022 9.9    
2023 8.0    
2024 5.1    
2025 4.0    
Thereafter 6.8    
Total lease payments 39.5    
Less: imputed interest (5.4)    
Total future lease obligation $ 34.1 $ 34.0 $ 38.8