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Debt Obligations, Debt Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Scheduled Maturities of Debt [Abstract]    
Remainder of 2021 $ 0.0  
2022 1,400.0  
2023 1,250.0  
2024 850.0  
2025 1,150.0  
Thereafter 24,171.4  
Total 28,821.4 $ 30,146.4
Senior Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2021 0.0  
2022 1,400.0  
2023 1,250.0  
2024 850.0  
2025 1,150.0  
Thereafter 21,525.0  
Total 26,175.0  
Junior Subordinated Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2021 0.0  
2022 0.0  
2023 0.0  
2024 0.0  
2025 0.0  
Thereafter 2,646.4  
Total $ 2,646.4