Acquisitions (Tables)

12 Months Ended

Sep. 30, 2023

Business Combination and Asset Acquisition [Abstract]

Schedule of Aggregate Merger Consideration

(in millions)	Fair Value
Cash and cash equivalents	$	8.2
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties	7.7
Receivable from clients, net	51.9
Financial instruments owned, at fair value	45.7
Deferred income taxes, net	(3.3)
Property and equipment, net	0.1
Physical commodities inventory, net	22.5
Other assets	6.7
Total fair value of tangible assets acquired	139.5
Accounts payable and other accrued liabilities	40.0
Financial instruments sold, not yet purchased, at fair value	28.3
Payables to lenders under loans	10.1
Payables to broker-dealers, clearing organizations, and counterparties	0.4
Payables to clients	2.6
Income taxes payable	0.8
Total fair value of liabilities assumed	82.2
Fair value of tangible net assets acquired	$	57.3
Identifiable intangible assets acquired
Client relationships	$	4.7
Supplier relationships	3.7
Trade name	0.4
Non-compete	0.1
Total fair value of intangible assets acquired	8.9
Fair value of identifiable net assets acquired	66.2
Total merger consideration	42.7
Gain on acquisition	$	23.5