Commodity and Other Repurchase Agreements and Collateralized Transactions Schedule of Collateralized Financings by Collateral Type (Tables)

6 Months Ended

Mar. 31, 2020

Financial Instruments Owned and Pledged as Collateral [Line Items]

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

Securities sold under agreements to repurchase	March 31, 2020		September 30, 2019
U.S. Treasury obligations	$	32.2	$	108.8
U.S. government agency obligations	264.1		359.5
Asset-backed obligations	76.5		96.7
Agency mortgage-backed obligations	2,402.8		2,208.7
Corporate bonds	24.7		—
Total securities sold under agreement to repurchase	2,800.3		2,773.7
Securities loaned
Equity securities	1,068.8		1,459.9
Total securities loaned	1,068.8		1,459.9
Gross amount of secured financing	$	3,869.1	$	4,233.6

The following tables provide the netting of securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowed and securities loaned as of the periods indicated (in millions):

	March 31, 2020
Offsetting of collateralized transactions:	Gross Amounts Recognized		Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts Presented in the Condensed Consolidated Balance Sheet
Securities purchased under agreements to resell	$	1,260.0	$	—	$	1,260.0
Securities borrowed	$	1,063.8	$	—	$	1,063.8
Securities sold under agreements to repurchase	$	2,800.3	$	—	$	2,800.3
Securities loaned	$	1,068.8	$	—	$	1,068.8

	September 30, 2019
Offsetting of collateralized transactions:	Gross Amounts Recognized		Amounts Offset in the Condensed Consolidated Balance Sheet			Net Amounts Presented in the Condensed Consolidated Balance Sheet
Securities purchased under agreements to resell	$	1,474.4	$	(49.9	)	$	1,424.5
Securities borrowed	$	1,423.2	$	—		$	1,423.2
Securities sold under agreements to repurchase	$	2,823.6	$	(49.9	)	$	2,773.7
Securities loaned	$	1,459.9	$	—		$	1,459.9