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Debt Obligations, Debt Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Scheduled Maturities of Debt [Abstract]    
Remainder of 2018 $ 2,707.6  
2019 1,500.0  
2020 1,500.0  
2021 1,325.0  
2022 650.0  
Thereafter 18,445.6  
Total 26,128.2 $ 24,780.1
Commercial Paper Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2018 2,707.6  
2019 0.0  
2020 0.0  
2021 0.0  
2022 0.0  
Thereafter 0.0  
Total 2,707.6  
Senior Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2018 0.0  
2019 1,500.0  
2020 1,500.0  
2021 1,325.0  
2022 650.0  
Thereafter 15,775.0  
Total 20,750.0  
Junior Subordinated Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2018 0.0  
2019 0.0  
2020 0.0  
2021 0.0  
2022 0.0  
Thereafter 2,670.6  
Total $ 2,670.6