Securities and Commodity Financing Transactions - Gross Obligations Contractual Maturities (Tables)

12 Months Ended

Sep. 30, 2020

Brokers and Dealers [Abstract]

Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets

The following tables provide the contractual maturities of gross obligations under repurchase and securities lending agreements as of the periods indicated (in millions):

	September 30, 2020
	Overnight and Open		Less than 30 Days		30-90 Days		Over 90 Days		Total
Securities sold under agreements to repurchase	$	1,736.3	$	1,069.2	$	325.0	25.0		$	3,155.5
Securities loaned	1,441.9		—		—		—		1,441.9
Gross amount of secured financing	$	3,178.2	$	1,069.2	$	325.0	$	25.0	$	4,597.4

	September 30, 2019
	Overnight and Open		Less than 30 Days		30-90 Days		Over 90 Days	Total
Securities sold under agreements to repurchase	$	1,553.9	$	565.8	$	654.0	—	$	2,773.7
Securities loaned	1,459.9		—		—		—	1,459.9
Gross amount of secured financing	$	3,013.8	$	565.8	$	654.0	—	$	4,233.6

Schedule of Financial Instruments Owned and Pledged as Collateral

The following table provides the underlying collateral types of the gross obligations under repurchase and securities lending agreements as of the periods indicated (in millions):

Securities sold under agreements to repurchase	September 30, 2020		September 30, 2019
U.S. Treasury obligations	$	815.8	$	108.8
U.S. government agency obligations	279.5		359.5
Asset-backed obligations	18.0		96.7
Agency mortgage-backed obligations	1,990.0		2,208.7
Corporate bonds	52.2		—
Total securities sold under agreement to repurchase	$	3,155.5	$	2,773.7
Securities loaned
Equity securities	1,441.9		1,459.9
Total securities loaned	1,441.9		1,459.9
Gross amount of secured financing	$	4,597.4	$	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):

	September 30, 2020
Offsetting of collateralized transactions:	Gross Amounts Recognized		Amounts Offset in the Consolidated Balance Sheet		Net Amounts Presented in the Consolidated Balance Sheet
Securities purchased under agreements to resell	$	1,696.2	$	—	$	1,696.2
Securities borrowed	$	1,440.0	$	—	$	1,440.0
Securities sold under agreements to repurchase	$	3,155.5	$	—	$	3,155.5
Securities loaned	$	1,441.9	$	—	$	1,441.9

	September 30, 2019
Offsetting of collateralized transactions:	Gross Amounts Recognized		Amounts Offset in the Consolidated Balance Sheet		Net Amounts Presented in the 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