Physical Commodities Inventory - Narrative (Details) bu in Millions, $ in Millions	Dec. 31, 2021 USD ($) bu	Sep. 30, 2021 USD ($)
Inventory [Line Items]
Agricultural related inventory	$ 317.7	$ 248.6
Soybeans
Inventory [Line Items]
Agricultural related inventory (in bushels) \| bu	2.8
Agricultural related inventory	$ 34.7

Carrying amount as of the balance sheet date of merchandise or supplies held which are related to plants and animals.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_AgriculturalRelatedInventory
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant