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Revenue from Contracts with Clients - Revenue from Contracts with Clients (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 920.7 | $ 255.5
Sales of physical commodities | 13,918.9 | 8,883.5
Principal gains, net | 251.1 | 203.4
Interest income | 31.0 | 21.2
Total revenues | 14,341.4 | 9,250.5
Total operating revenues | 450.5 | 380.1
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1,124.7 | 758.9
Total operating revenues | 304.1 | 286.2
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 884.6 | 172.4
Total operating revenues | 107.7 | 60.5
South America |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 17.7 | 14.6
Total operating revenues | 17.7 | 14.6
Middle East and Asia |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 12,312.2 | 8,302.0
Total operating revenues | 18.8 | 16.2
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2.2 | 2.6
Total operating revenues | 2.2 | 2.6
Point-in-time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 893.8 | 232.8
Time elapsed |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 26.9 | 22.7
Exchange-traded futures and options |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 44.6 | 46.3
OTC derivative brokerage |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 4.4 | 3.8
Equities and fixed income |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 14.6 | 14.4
Mutual funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1.2 | 1.2
Insurance and annuity products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2.8 | 2.3
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0.8 | 0.2
Total sales-based commission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 68.4 | 68.2
Mutual funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.9 | 3.3
Insurance and annuity products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 4.4 | 3.9
Total trailing commission |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 8.3 | 7.2
Clearing fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 36.4 | 38.5
Trade conversion fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2.0 | 2.1
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1.2 | 3.4
Total commission and clearing fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 116.3 | 119.4
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 | 10.6 | 8.7
Advisory and consulting fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 7.5 | 6.0
Sweep program fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0.5 | 0.8
Client account fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3.7 | 4.1
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1.6 | 3.2
Total consulting, management, and account fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 24.1 | 23.0
Precious metals sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 780.3 | 113.1
Physical precious metals trading |  |
Disaggregation of Revenue [Line Items] |  |
Sales of physical commodities | 12,315.3 | 8,295.8
Physical agricultural and energy product trading |  |
Disaggregation of Revenue [Line Items] |  |
Sales of physical commodities | $ 823.3 | $ 474.6

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