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Debt Obligations, Debt Maturities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Scheduled Maturities of Debt [Abstract]    
2013 $ 40.0  
2014 1,150.0  
2015 1,300.0  
2016 750.0  
2017 800.0  
After 2017 12,927.7  
Total 16,967.7 16,179.3
Commercial Paper [Member]
   
Scheduled Maturities of Debt [Abstract]    
2013 40.0  
2014 0  
2015 0  
2016 0  
2017 0  
After 2017 0  
Total 40.0  
Multi-Year Revolving Credit Facility [Member]
   
Scheduled Maturities of Debt [Abstract]    
2013 0  
2014 0  
2015 0  
2016 0  
2017 0  
After 2017 45.0  
Total 45.0  
Senior Notes [Member]
   
Scheduled Maturities of Debt [Abstract]    
2013 0  
2014 1,150.0  
2015 1,300.0  
2016 750.0  
2017 800.0  
After 2017 11,350.0  
Total 15,350.0  
Junior Subordinated Notes [Member]
   
Scheduled Maturities of Debt [Abstract]    
2013 0  
2014 0  
2015 0  
2016 0  
2017 0  
After 2017 1,532.7  
Total $ 1,532.7