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v3.21.1

Revenue from Contracts with Clients - Revenue from Contracts with Clients (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 151.9 | $ 139.2 | $ 294.3 | $ 247.7
Principal gains, net | 265.2 | 168.5 | 468.6 | 281.0
Interest income | 23.4 | 41.7 | 44.6 | 87.7
Total revenues | 11,244.8 | 20,366.3 | 20,495.3 | 31,611.3
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 853.6 | 585.6 | 1,612.5 | 1,097.9
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 490.1 | 150.0 | 662.5 | 261.6
South America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14.5 | 16.3 | 29.1 | 31.5
Middle East and Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9,885.1 | 19,613.3 | 18,187.1 | 30,218.8
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1.5 | 1.1 | 4.1 | 1.5
Point-in-time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 127.4 | 113.7 | 247.1 | 198.3
Time elapsed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 24.5 | 25.5 | 47.2 | 49.4
Exchange-traded futures and options |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 49.4 | 40.1 | 95.7 | 72.5
OTC derivative brokerage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 4.6 | 6.7 | 8.4 | 12.2
Equities and fixed income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 19.4 | 7.1 | 33.8 | 11.4
Mutual funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1.5 | 1.6 | 2.7 | 2.9
Insurance and annuity products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 2.3 | 2.4 | 4.6 | 4.5
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0.1 | 0.5 | 0.3 | 0.8
Sales-based commission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 77.3 | 58.4 | 145.5 | 104.3
Mutual funds |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3.6 | 3.5 | 6.9 | 6.6
Insurance and annuity products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 4.2 | 4.0 | 8.1 | 7.7
Trailing commissions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 7.8 | 7.5 | 15.0 | 14.3
Clearing fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 39.4 | 41.6 | 77.9 | 71.1
Trade conversion fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3.6 | 4.2 | 5.7 | 5.7
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1.7 | 4.9 | 5.1 | 8.4
Commission and clearing fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 129.8 | 116.6 | 249.2 | 203.8
Underwriting fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0.2 | 0.2 | 0.4 | 0.4
Asset management fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 9.3 | 8.7 | 18.0 | 16.2
Advisory and consulting fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 6.6 | 5.7 | 12.6 | 11.3
Sweep program fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 0.8 | 3.6 | 1.6 | 7.6
Client account fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 3.8 | 3.1 | 7.9 | 6.1
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 1.4 | 1.3 | 4.6 | 2.3
Consulting, management, and account fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 22.1 | 22.6 | 45.1 | 43.9
Physical precious metals trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales of physical commodities | 10,295.7 | 19,694.7 | 18,704.6 | 30,352.7
Physical agricultural and energy product trading |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales of physical commodities | $ 508.6 | $ 322.2 | $ 983.2 | $ 642.2

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