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Debt Obligations, Debt Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Scheduled Maturities of Debt [Abstract]    
Remainder of 2015 $ 869.5  
2016 750.0  
2017 800.0  
2018 1,100.0  
2019 1,500.0  
After 2019 17,478.3  
Total 22,497.8 $ 21,389.2
Commercial Paper Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2015 869.5  
2016 0.0  
2017 0.0  
2018 0.0  
2019 0.0  
After 2019 0.0  
Total 869.5  
Senior Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2015 0.0  
2016 750.0  
2017 800.0  
2018 1,100.0  
2019 1,500.0  
After 2019 16,000.0  
Total 20,150.0  
Junior Subordinated Notes [Member]    
Scheduled Maturities of Debt [Abstract]    
Remainder of 2015 0.0  
2016 0.0  
2017 0.0  
2018 0.0  
2019 0.0  
After 2019 1,478.3  
Total $ 1,478.3