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Acquisitions - Gain Capital Holdings Inc Preliminary Purchase Price Allocation (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 26, 2020 | Sep. 30, 2020 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 01, 2020
Preliminary Purchase Price Allocation |  |  |  |  |
Bargain purchase gain |  | $ 81.8 | $ 5.4 |  |
Acquired finite-lived intangible asset, weighted average useful life |  |  |  | 1 year |
Gain Capital Holdings Inc [Member] |  |  |  |  |
Preliminary 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 | 52.7 |  |  |  |
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 |  |  |  |
Total fair value of tangible liabilities assumed | 1,036.0 |  |  |  |
Fair value of tangible net assets acquired (4) | 282.7 |  |  |  |
Identifiable intangible assets acquired | 35.7 |  |  |  |
Fair value of identifiable net assets acquired | 318.4 |  |  |  |
Total merger consideration | 236.6 |  |  |  |
Bargain purchase gain | 81.8 |  |  |  |
Business combination, convertible senior notes redeemed amount |  |  |  |  | $ 91.5
Gain Capital Holdings Inc [Member] | Trademarks /Domain Names [Member] |  |  |  |  |
Preliminary Purchase Price Allocation |  |  |  |  |
Identifiable intangible assets acquired | $ 3.7 |  |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 5 years |  |  |  |
Gain Capital Holdings Inc [Member] | Software Programs/Platforms [Member] |  |  |  |  |
Preliminary Purchase Price Allocation |  |  |  |  |
Identifiable intangible assets acquired | $ 22.2 |  |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 3 years |  |  |  |
Gain Capital Holdings Inc [Member] | Customer base [Member] |  |  |  |  |
Preliminary Purchase Price Allocation |  |  |  |  |
Identifiable intangible assets acquired | $ 9.8 |  |  |  |
Acquired finite-lived intangible asset, weighted average useful life | 4 years |  |  |  |

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