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Acquisitions - GMP Securities, LLC (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 14, 2019 | Sep. 30, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Net assets acquired based on fair values: |  |  |  |
Bargain purchase gain |  | $ 81.8 | $ 5.4 |
GMP Securities Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of stock purchased | 100.00% |  |  |
Total merger consideration | $ 8.2 |  |  |
Business combination, excess amount above book value of tangible assets acquired | 2.0 |  |  |
Operating revenues post-acquisition results of the acquired business |  |  |  | $ 8.2
Net income (loss) post-acquisition results of the acquired business |  |  |  | 2.1
Net assets acquired based on fair values: |  |  |  |
Cash and cash equivalents | 1.1 |  |  |
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties | 7.7 |  |  |
Financial instruments owned, at fair value | 7.1 |  |  |
Deferred income taxes, net | 2.7 |  |  |
Property and equipment | 0.7 |  |  |
Other assets | 0.7 |  |  |
Total fair value of tangible assets acquired | 20.0 |  |  |
Accounts payable and other accrued liabilities | 1.9 |  |  |
Payable to broker-dealers, clearing organizations, and counterparties | 0.1 |  |  |
Financial instruments sold, not yet purchased, at fair value | 4.4 |  |  |
Total fair value of tangible liabilities assumed | 6.4 |  |  |
Fair value of identifiable net assets acquired | 13.6 |  |  |
Purchase price | 8.2 |  |  |
Bargain purchase gain | $ 5.4 |  |  | $ 5.4

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