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Debt Obligations, Debt Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Scheduled Maturities of Debt [Abstract] |  |
2016 | $ 1,864.1 |
2017 | 800.0 |
2018 | 1,100.0 |
2019 | 1,500.0 |
2020 | 1,500.0 |
After 2020 | 15,974.4 |
Total | 22,738.5 | $ 21,389.2
Commercial Paper Notes [Member] |  |
Scheduled Maturities of Debt [Abstract] |  |
2016 | 1,114.1 |
2017 | 0.0 |
2018 | 0.0 |
2019 | 0.0 |
2020 | 0.0 |
After 2020 | 0.0 |
Total | 1,114.1 |
Senior Notes [Member] |  |
Scheduled Maturities of Debt [Abstract] |  |
2016 | 750.0 |
2017 | 800.0 |
2018 | 1,100.0 |
2019 | 1,500.0 |
2020 | 1,500.0 |
After 2020 | 14,500.0 |
Total | 20,150.0 |
Junior Subordinated Notes [Member] |  |
Scheduled Maturities of Debt [Abstract] |  |
2016 | 0.0 |
2017 | 0.0 |
2018 | 0.0 |
2019 | 0.0 |
2020 | 0.0 |
After 2020 | 1,474.4 |
Total | $ 1,474.4 |

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- Definition 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. + References 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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