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v3.20.4

Revenue from Contracts with Clients - Revenue from Contracts with Clients (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 142.4 | $ 108.5
Principal gains, net | 203.4 | 112.5
Interest income | 21.2 | 46.0
Total revenues | 9,250.5 | 11,245.0
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 758.9 | 512.3
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 172.4 | 111.6
South America |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 14.6 | 15.2
Middle East and Asia |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 8,302.0 | 10,605.5
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2.6 | 0.4
Point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 119.7 | 84.6
Time elapsed |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 22.7 | 23.9
Exchange-traded futures and options |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 46.3 | 32.4
OTC derivative brokerage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.8 | 5.5
Equities and fixed income |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 14.4 | 4.3
Mutual funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1.2 | 1.3
Insurance and annuity products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2.3 | 2.1
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0.2 | 0.3
Sales-based commission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 68.2 | 45.9
Mutual funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.3 | 3.1
Insurance and annuity products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.9 | 3.7
Trailing commissions |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 7.2 | 6.8
Clearing fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 38.5 | 29.5
Trade conversion fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2.1 | 1.5
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.4 | 3.5
Commission and clearing fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 119.4 | 87.2
Underwriting fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0.2 | 0.2
Asset management fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 8.7 | 7.5
Advisory and consulting fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 6.0 | 5.6
Sweep program fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0.8 | 4.0
Client account fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 4.1 | 3.0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.2 | 1.0
Consulting, management, and account fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 23.0 | 21.3
Physical precious metals trading |  |
Disaggregation of Revenue [Line Items] |  |
Sales of physical commodities | 8,408.9 | 10,658.0
Physical agricultural and energy product trading |  |
Disaggregation of Revenue [Line Items] |  |
Sales of physical commodities | $ 474.6 | $ 320.0

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