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Revenue from Contracts with Clients Disaggregation of Revenues Table (Tables) | 6 Months Ended
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Mar. 31, 2019
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] |
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Revenues from contracts with clients: |  |  |  |  |  |  |
Commission and clearing fees: |  |  |  |  |  |  |
Sales-based: |  |  |  |  |  |  |
Exchange-traded futures and options | $ | 31.2 |  |  | $ | 44.0 |  |  | $ | 70.3 |  |  | $ | 78.6 |
OTC derivative brokerage | 7.3 |  |  | 8.3 |  |  | 16.2 |  |  | 15.8 |
Equities and fixed income | 3.6 |  |  | 2.8 |  |  | 6.8 |  |  | 5.6 |
Mutual funds | 1.9 |  |  | 2.1 |  |  | 4.5 |  |  | 4.1 |
Insurance and annuity products | 1.5 |  |  | 1.5 |  |  | 3.0 |  |  | 3.0 |
Other | 0.5 |  |  | — |  |  | 0.7 |  |  | 0.6 |
Total sales-based commission | 46.0 |  |  | 58.7 |  |  | 101.5 |  |  | 107.7 |
Trailing: |  |  |  |  |  |  |
Mutual funds | 3.0 |  |  | 3.3 |  |  | 6.2 |  |  | 6.6 |
Insurance and annuity products | 3.4 |  |  | 3.7 |  |  | 7.1 |  |  | 7.3 |
Total trailing commission | 6.4 |  |  | 7.0 |  |  | 13.3 |  |  | 13.9 |
Clearing fees | 26.8 |  |  | 34.5 |  |  | 59.4 |  |  | 59.5 |
Trade conversion fees | 3.3 |  |  | 2.0 |  |  | 4.9 |  |  | 3.8 |
Other | 2.6 |  |  | 4.2 |  |  | 5.5 |  |  | 8.0 |
Total commission and clearing fees: | 85.1 |  |  | 106.4 |  |  | 184.6 |  |  | 192.9 |
Consulting, management, and account fees: |  |  |  |  |  |  |
Underwriting fees | 0.2 |  |  | 0.7 |  |  | 0.5 |  |  | 1.3 |
Asset management fees | 6.0 |  |  | 6.4 |  |  | 12.2 |  |  | 12.5 |
Advisory and consulting fees | 4.7 |  |  | 4.8 |  |  | 9.7 |  |  | 9.4 |
Sweep program fees | 4.1 |  |  | 2.7 |  |  | 7.9 |  |  | 4.9
Customer account fees | 2.5 |  |  | 2.9 |  |  | 5.2 |  |  | 5.7 |
Other | 1.6 |  |  | 0.9 |  |  | 2.7 |  |  | 1.2 |
Total consulting, management, and account fees | 19.1 |  |  | 18.4 |  |  | 38.2 |  |  | 35.0 |
Total revenues from contracts with clients | $ | 104.2 |  |  | $ | 124.8 |  |  | $ | 222.8 |  |  | $ | 227.9 |
Method of revenue recognition: |  |  |  |  |  |  |
Point-in-time | $ | 83.0 |  |  | $ | 103.9 |  |  | $ | 179.7 |  |  | $ | 187.2 |
Time elapsed | 21.2 |  |  | 20.9 |  |  | 43.1 |  |  | 40.7 |
Total revenues from contracts with clients | 104.2 |  |  | 124.8 |  |  | 222.8 |  |  | 227.9 |
Other sources of revenues |  |  |  |  |  |  |
Precious metals trading | 6,660.9 |  |  | 6,031.6 |  |  | 12,616.4 |  |  | 13,563.5 |
Agricultural and energy merchandising and origination | 268.6 |  |  | 224.2 |  |  | 608.9 |  |  | 406.7 |
Principal gains, net | 110.3 |  |  | 98.5 |  |  | 203.1 |  |  | 175.6 |
Interest income | 48.2 |  |  | 27.9 |  |  | 93.2 |  |  | 51.9 |
Total revenues | $ | 7,192.2 |  |  | $ | 6,507.0 |  |  | $ | 13,744.4 |  |  | $ | 14,425.6 |
Primary geographic region: |  |  |  |  |  |  |
United States | $ | 456.6 |  |  | $ | 404.1 |  |  | $ | 983.6 |  |  | $ | 728.0 |
Europe | 53.8 |  |  | 47.8 |  |  | 107.1 |  |  | 93.0 |
South America | 12.4 |  |  | 16.7 |  |  | 23.9 |  |  | 31.7 |
Middle East and Asia | 6,667.3 |  |  | 6,037.4 |  |  | 12,625.9 |  |  | 13,571.0 |
Other | 2.1 |  |  | 1.0 |  |  | 3.9 |  |  | 1.9 |
Total revenues | $ | 7,192.2 |  |  | $ | 6,507.0 |  |  | $ | 13,744.4 |  |  | $ | 14,425.6 |

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