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Acquisitions - Fillmore Advisors, LLC Acquisition (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |
Acquired finite-lived intangible asset, weighted average useful life |  | 1 year |
Preliminary Purchase Price Allocation |  |  |
Goodwill |  | $ 54.7 | $ 51.2
Fillmore Advisors, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of stock purchased | 100.00% |  |
Aggregate cash consideration | $ 1.4 |  |
Percentage of contingent earn-out payments | 50.00% |  |
Fair value of contingent consideration | $ 1.8 |  |
Acquired finite-lived intangible asset, weighted average useful life | 5 years |  |
Preliminary Purchase Price Allocation |  |  |
Cash and cash equivalents | $ 0.2 |  |
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties | 0.3 |  |
Receivables from clients | 0.2 |  |
Other assets | 0.4 |  |
Total fair value of tangible assets acquired | 1.1 |  |
Accounts payable and other accrued liabilities | 0.5 |  |
Total fair value of tangible liabilities assumed | 0.5 |  |
Fair value of identifiable net assets acquired | 0.6 |  |
Purchase price | 3.2 |  |
Total fair value of tangible assets acquired | 2.6 |  |
Purchase price allocated to client base intangible assets acquired | 0.7 |  |
Total excess purchase price allocated to identifiable intangible assets | 0.7 |  |
Goodwill | 1.9 |  |
Cash [Member] | Fillmore Advisors, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of contingent consideration | $ 1.8 |  |

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