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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Gain (Loss) on Investments [Line Items]
Proceeds from investments sold, matured or repaid	$ 2,057.9us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments	$ 2,863.6us-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		2,675.4us-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	0us-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	209.4us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember	188.2us-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	$ 1,848.5us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember

X

- 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

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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=56944662&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

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