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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid | $ 982.2 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments | $ 1,820.3 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Cost of investments acquired | (1,526.0)us-gaap_PaymentsToAcquireInvestments | (2,728.2)us-gaap_PaymentsToAcquireInvestments
Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Proceeds from investments sold, matured or repaid |  | 1,705.9 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember
Cost of investments acquired | (1,371.8)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember | (2,598.5)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 | (4.4)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 | 128.1 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | 114.4 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember
Cost of investments acquired | (154.2)us-gaap_PaymentsToAcquireInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | (125.3)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 | $ 854.1 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=31042434&loc=d3e3213-108585 + Details
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