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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | $ 2,057.9 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments | $ 2,863.6 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Cost of investments acquired | (2,468.2)us-gaap_PaymentsToAcquireInvestments | (4,032.9)us-gaap_PaymentsToAcquireInvestments
Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid |  | 2,675.4 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember
Cost of investments acquired | (2,154.4)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember | (3,815.7)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember
Trading Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Cost of investments acquired | 0 us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_TradingAccountAssetsMember | (40.5)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_TradingAccountAssetsMember
Derivative and other [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | 209.4 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | 188.2 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember
Cost of investments acquired | (313.8)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | (176.7)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember
Investment Income [Member] | Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | $ 1,848.5 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember |

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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=56944662&loc=d3e3213-108585 + Details
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