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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Gain (Loss) on Investments [Line Items] |  |
Document Period End Date | Jun. 30, 2014 |
Proceeds from investments sold, matured or repaid | $ 4,754.5 | $ 7,396.3
Cost of investments acquired | (5,929.7) | (7,271.4)
Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid |  | 7,052.1
Cost of investments acquired | (5,594.5) | (7,148.7)
Trading (acquired for holding) [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | 54.9 | 91.8
Cost of investments acquired | (67.8) | (10.2)
Derivative and other [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | 297.5 | 252.4
Cost of investments acquired | (267.4) | (112.5)
Net Investment Income [Member] | Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | $ 4,402.1 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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