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Acquisitions - UOB Bullion and Futures Limited (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |
Purchase price allocated to goodwill |  | $ 58.1 | $ 54.7
Acquired finite-lived intangible asset, weighted average useful life |  | 1 year |
UOB Bullion and Futures Limited |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price | $ 5.0 |  |
Payable to clients | 351.8 |  |
Purchase price allocated to property and equipment acquired | 0.8 |  |
Purchase price allocated to client base intangible assets acquired | 3.1 |  |
Purchase price allocated to goodwill | $ 1.1 |  |
Operating revenues post-acquisition results of the acquired business |  |  | 10.3
Net income (loss) post-acquisition results of the acquired business |  |  | $ (1.4)
UOB Bullion and Futures Limited | Client Base Intangible Assets |  |  |
Business Acquisition [Line Items] |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 5 years |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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