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Securities and Commodity Financing Transactions - Schedule of Carrying Value of Repurchase Agreements, and Securities Lending Agreements by Remaining Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 16,527.9	$ 9,196.4
Securities loaned	1,615.9	1,117.3
Gross amount of secured financing	18,143.8	10,313.7
Overnight and Open
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	15,260.8	8,300.0
Securities loaned	1,615.9	1,117.3
Gross amount of secured financing	16,876.7	9,417.3
Less than 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	585.4	786.8
Securities loaned	0.0	0.0
Gross amount of secured financing	585.4	786.8
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	631.0	107.0
Securities loaned	0.0	0.0
Gross amount of secured financing	631.0	107.0
Over 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	50.7	2.6
Securities loaned	0.0	0.0
Gross amount of secured financing	$ 50.7	$ 2.6

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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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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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Amount, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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