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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from investments sold, matured or repaid | $ 5,609.2 | $ 9,432.2 | $ 6,206.7
Cost of investments acquired | (7,221.4) | (8,940.8) | (5,972.7)
Available-for-sale Securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from investments sold, matured or repaid |  | 8,986.9 | 5,833.4
Cost of investments acquired | (6,741.2) | (8,757.5) | (5,640.1)
Held-to-maturity Securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from investments sold, matured or repaid |  |  | 109.6
Cost of investments acquired |  |  | (68.7)
Trading (acquired for holding) |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from investments sold, matured or repaid | 54.9 | 92.9 | 106.1
Cost of investments acquired | (99.7) | (20.8) | (122.3)
Derivative and other |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from investments sold, matured or repaid | 470.2 | 352.4 | 157.6
Cost of investments acquired | (380.5) | (162.5) | (141.6)
Net Investment Income |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Available For Sale Securities On Fixed Maturity Under Commitment Agreement | 5,033.4 | 8,986.9 | 4,603.0
Net Investment Income | Available-for-sale Securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from investments sold, matured or repaid | $ 5,084.1 |  |

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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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