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Leases - Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Leases    
2021 $ 2.3  
2022 1.7  
2023 1.4  
2024 1.3  
2025 1.3  
2026-Thereafter 4.0  
Total lease payments 12.0  
Less: imputed interest 1.8  
Total lease liabilities $ 10.2 $ 11.7