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Leases - Schedule of Maturities of Lease Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Finance Lease Liabilities, Payments, Due [Abstract]      
2021 $ 0.4    
2022 1.5    
2023 1.1    
2024 0.6    
2025 0.3    
Thereafter 0.1    
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 3.0    
2022 11.6    
2023 9.6    
2024 6.7    
2025 4.8    
Thereafter 8.8    
Total lease payments 44.5    
Less: imputed interest (5.6)    
Total future lease obligation $ 38.9 $ 34.0 $ 36.6