Debt Obligations, Debt Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Scheduled Maturities of Debt [Abstract]
Remainder of 2017	$ 2,255.2
2018	1,100.0
2019	1,500.0
2020	1,500.0
2021	575.0
After 2021	16,649.4
Total	23,579.6	$ 23,901.6
Commercial Paper Notes [Member]
Scheduled Maturities of Debt [Abstract]
Remainder of 2017	1,455.2
2018	0.0
2019	0.0
2020	0.0
2021	0.0
After 2021	0.0
Total	1,455.2
Senior Notes [Member]
Scheduled Maturities of Debt [Abstract]
Remainder of 2017	800.0
2018	1,100.0
2019	1,500.0
2020	1,500.0
2021	575.0
After 2021	15,175.0
Total	20,650.0
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	1,474.4
Total	$ 1,474.4

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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