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Indebtedness - Total Debt Maturities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Disclosure [Abstract]  
2021 $ 0.0
2022 1,000.0
2023 0.0
2024 0.0
2025 1,750.0
2026 and thereafter 4,750.0
Total $ 7,500.0