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Commodity and Other Repurchase Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Securities sold under agreements to repurchase	$ 1,393.1	$ 1,167.1
Fair Value of Securities Received as Collateral that Can be Resold or Repledged	631.7
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged	306.9
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	19.4
Securities Loaned, Fair Value of Collateral	108.4
Financial Instruments Owned and Pledged as Collateral, Amount Not Eligible to be Repledged by Counterparty	1,406.6
Securities Loaned	111.1	0.0
Collateralized Financings	1,504.2
Sales Repurchase Agreements	0.8	1.5
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	19.4	$ 47.2
Maturity Overnight [Member]
Securities sold under agreements to repurchase	640.2
Securities Loaned	111.1
Collateralized Financings	751.3
Maturity Less than 30 Days [Member]
Securities sold under agreements to repurchase	432.9
Securities Loaned	0.0
Collateralized Financings	432.9
Maturity 30 to 90 Days [Member]
Securities sold under agreements to repurchase	320.0
Securities Loaned	0.0
Collateralized Financings	320.0
Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase	0.0
Securities Loaned	0.0
Collateralized Financings	0.0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities sold under agreements to repurchase	1,017.1
Asset-backed Securities [Member]
Securities sold under agreements to repurchase	36.4
US Government Debt Securities [Member]
Securities sold under agreements to repurchase	7.0
US Government Agencies Debt Securities [Member]
Securities sold under agreements to repurchase	332.6
Equity Securities [Member]
Securities Loaned	$ 111.1

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Financing Receivables, net - Sales/Repurchase Agreements

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The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities.

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Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

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Fair value of the collateral, or portion thereof, that has been re-pledged, delivered, or otherwise used.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions where counterparty has the right to re-pledge such.

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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of the securities pledged as collateral against securities loaned.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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