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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | $ 4,162.1 | $ 4,754.5
Cost of investments acquired | (4,965.6) | (5,929.7)
Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid |  | 4,402.1
Cost of investments acquired | (4,495.3) | (5,594.5)
Trading Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | 0.0 | 54.9
Cost of investments acquired | 0.0 | (67.8)
Derivative and other [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | 301.5 | 297.5
Cost of investments acquired | (470.3) | $ (267.4)
Investment Income [Member] | Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | $ 3,860.6 |

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