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Securities and Commodity Financing Transactions - Schedule of Carrying Value of Repurchase Agreements and Securities Lending Agreements by Class of Collateral Pledged (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
U.S. Treasury obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	19,311.9	9,673.7
U.S. government agency obligations and municipal bonds
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	804.3	652.0
Asset-backed obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	55.0	136.1
Agency mortgage-backed obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	7,521.4	5,079.6
Foreign government obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	881.4	649.6
Corporate bonds
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	949.7	336.9
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities loaned	$ 2,550.8	$ 1,615.9

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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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