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Commitments and Contingencies - Analysis of lease liability maturities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Finance Leases  
2021 $ 12.1
2022 723.1
2023 0.0
2024 0.0
2025 0.0
Thereafter 0.0
Total undiscounted lease payments 735.2
Imputed interest (15.1)
Debt financing costs (2.9)
Total lease liabilities $ 717.2