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Debt Obligations, Debt Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Scheduled Maturities of Debt [Abstract]    
Remainder of 2017 $ 1,910.0  
2018 1,100.0  
2019 1,500.0  
2020 1,500.0  
2021 575.0  
After 2021 18,349.4  
Total 24,934.4 $ 23,901.6
Commercial Paper Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2017 1,910.0  
2018 0.0  
2019 0.0  
2020 0.0  
2021 0.0  
After 2021 0.0  
Total 1,910.0  
Senior Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2017 0.0  
2018 1,100.0  
2019 1,500.0  
2020 1,500.0  
2021 575.0  
After 2021 15,175.0  
Total 19,850.0  
Junior Subordinated Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2017 0.0  
2018 0.0  
2019 0.0  
2020 0.0  
2021 0.0  
After 2021 3,174.4  
Total $ 3,174.4