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Debt and Financing Obligation - Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 $ 0.8  
2022 3.2  
2023 3.3  
2024 5.4  
2025 0.0  
2026-Thereafter 602.0  
Total borrowings $ 614.7 $ 690.5