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Acquisitions - Gain Capital Holdings Inc Preliminary Purchase Price Allocation (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 01, 2020
Purchase Price Allocation |  |  |  |  |
Bargain purchase gain |  | $ 3.3 | $ 81.9 | $ 5.5 |
Acquired finite-lived intangible asset, weighted average useful life |  | 1 year |  |  |
Gain Capital Holdings Inc |  |  |  |  |
Purchase Price Allocation |  |  |  |  |
Cash and cash equivalents |  | $ 507.2 |  |  |
Cash, securities and other assets segregated under federal and other regulations |  | 497.4 |  |  |
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties |  | 249.7 |  |  |
Receivables from clients, net |  | 2.0 |  |  |
Income taxes receivable |  | 0.4 |  |  |
Deferred income taxes, net |  | 23.0 |  |  |
Property and equipment, net |  | 6.1 |  |  |
Right of use assets, net |  | 15.0 |  |  |
Other assets |  | 17.9 |  |  |
Total fair value of tangible assets acquired |  | 1,318.7 |  |  |
Accounts payable and other accrued liabilities |  | 49.4 |  |  |
Operating lease liabilities |  | 15.0 |  |  |
Payable to clients |  | 863.4 |  |  |
Payable to broker-dealers, clearing organizations, and counterparties |  | 0.5 |  |  |
Income taxes payable |  | 12.4 |  |  |
Convertible senior notes | $ 92.0 | 92.0 |  |  |
Total fair value of tangible liabilities assumed |  | 1,032.7 |  |  |
Fair value of tangible net assets acquired |  | 286.0 |  |  |
Identifiable intangible assets acquired |  | 35.7 |  |  |
Fair value of identifiable net assets acquired |  | 321.7 |  |  |
Total merger consideration | $ 236.6 | 236.6 |  |  |
Bargain purchase gain |  | 85.1 |  |  |
Business combination, convertible senior notes redeemed amount |  |  |  |  | $ 91.5
Gain Capital Holdings Inc | Trademarks/domain names |  |  |  |  |
Purchase Price Allocation |  |  |  |  |
Identifiable intangible assets acquired |  | 3.7 |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 5 years |  |  |  |
Gain Capital Holdings Inc | Software programs/platforms |  |  |  |  |
Purchase Price Allocation |  |  |  |  |
Identifiable intangible assets acquired |  | 22.2 |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 3 years |  |  |  |
Gain Capital Holdings Inc | Customer base |  |  |  |  |
Purchase Price Allocation |  |  |  |  |
Identifiable intangible assets acquired |  | $ 9.8 |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 4 years |  |  |  |

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