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Debt Obligations, Debt Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Scheduled Maturities of Debt [Abstract]
Remainder of 2015	$ 650.0
2016	750.0
2017	800.0
2018	1,100.0
2019	1,500.0
After 2019	17,532.7
Total	22,332.7	$ 21,389.2
Commercial Paper 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	0.0
Total	0.0
Senior Notes [Member]
Scheduled Maturities of Debt [Abstract]
Remainder of 2015	650.0
2016	750.0
2017	800.0
2018	1,100.0
2019	1,500.0
After 2019	16,000.0
Total	20,800.0
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	1,532.7
Total	$ 1,532.7

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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