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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, 2025	Sep. 30, 2024
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 29,523.7	$ 16,527.9
Securities loaned	2,550.8	1,615.9
Gross amount of secured financing	32,074.5	18,143.8
Overnight and Open
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	26,173.4	15,260.8
Securities loaned	2,550.8	1,615.9
Gross amount of secured financing	28,724.2	16,876.7
Less than 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	3,128.5	585.4
Securities loaned	0.0	0.0
Gross amount of secured financing	3,128.5	585.4
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	180.4	631.0
Securities loaned	0.0	0.0
Gross amount of secured financing	180.4	631.0
Over 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	41.4	50.7
Securities loaned	0.0	0.0
Gross amount of secured financing	$ 41.4	$ 50.7

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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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