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Revenue from Contracts with Clients Disaggregation of Revenues Table (Tables) | 9 Months Ended
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Jun. 30, 2019
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] |
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Revenues from contracts with clients: |  |  |  |  |  |  |
Commission and clearing fees: |  |  |  |  |  |  |
Sales-based: |  |  |  |  |  |  |
Exchange-traded futures and options | $ | 40.4 |  |  | $ | 45.0 |  |  | $ | 110.7 |  |  | $ | 123.6 |
OTC derivative brokerage | 7.7 |  |  | 7.3 |  |  | 23.9 |  |  | 23.1 |
Equities and fixed income | 4.3 |  |  | 2.7 |  |  | 11.1 |  |  | 8.3 |
Mutual funds | 1.6 |  |  | 1.5 |  |  | 6.1 |  |  | 5.6 |
Insurance and annuity products | 2.1 |  |  | 1.5 |  |  | 5.1 |  |  | 4.5 |
Other | 0.3 |  |  | 0.6 |  |  | 1.0 |  |  | 1.2 |
Total sales-based commission | 56.4 |  |  | 58.6 |  |  | 157.9 |  |  | 166.3 |
Trailing: |  |  |  |  |  |  |
Mutual funds | 3.1 |  |  | 3.2 |  |  | 9.3 |  |  | 9.8 |
Insurance and annuity products | 3.6 |  |  | 3.7 |  |  | 10.7 |  |  | 11.0 |
Total trailing commission | 6.7 |  |  | 6.9 |  |  | 20.0 |  |  | 20.8 |
Clearing fees | 30.3 |  |  | 34.2 |  |  | 89.7 |  |  | 93.7 |
Trade conversion fees | 1.3 |  |  | 1.6 |  |  | 6.2 |  |  | 5.4 |
Other | 2.8 |  |  | 3.8 |  |  | 8.3 |  |  | 11.8 |
Total commission and clearing fees: | 97.5 |  |  | 105.1 |  |  | 282.1 |  |  | 298.0 |
Consulting, management, and account fees: |  |  |  |  |  |  |
Underwriting fees | 0.2 |  |  | 0.2 |  |  | 0.7 |  |  | 1.5 |
Asset management fees | 7.2 |  |  | 6.4 |  |  | 19.4 |  |  | 18.9 |
Advisory and consulting fees | 5.1 |  |  | 4.9 |  |  | 14.8 |  |  | 14.3 |
Sweep program fees | 4.2 |  |  | 3.3 |  |  | 12.1 |  |  | 8.2
Client account fees | 2.6 |  |  | 2.9 |  |  | 7.8 |  |  | 8.6 |
Other | 1.4 |  |  | 0.7 |  |  | 4.1 |  |  | 1.9 |
Total consulting, management, and account fees | 20.7 |  |  | 18.4 |  |  | 58.9 |  |  | 53.4 |
Total revenues from contracts with clients | $ | 118.2 |  |  | $ | 123.5 |  |  | $ | 341.0 |  |  | $ | 351.4 |
Method of revenue recognition: |  |  |  |  |  |  |
Point-in-time | $ | 95.0 |  |  | $ | 102.0 |  |  | $ | 274.7 |  |  | $ | 289.2 |
Time elapsed | 23.2 |  |  | 21.5 |  |  | 66.3 |  |  | 62.2 |
Total revenues from contracts with clients | 118.2 |  |  | 123.5 |  |  | 341.0 |  |  | 351.4 |
Other sources of revenues |  |  |  |  |  |  |
Physical precious metals trading | 7,327.8 |  |  | 6,613.0 |  |  | 19,944.2 |  |  | 20,176.5 |
Physical agricultural and energy product trading | 271.5 |  |  | 253.2 |  |  | 880.4 |  |  | 659.9 |
Principal gains, net | 102.3 |  |  | 94.9 |  |  | 305.4 |  |  | 270.5 |
Interest income | 53.2 |  |  | 33.7 |  |  | 146.4 |  |  | 85.6 |
Total revenues | $ | 7,873.0 |  |  | $ | 7,118.3 |  |  | $ | 21,617.4 |  |  | $ | 21,543.9 |
Primary geographic region: |  |  |  |  |  |  |
United States | $ | 474.8 |  |  | $ | 431.9 |  |  | $ | 1,458.4 |  |  | $ | 1,159.9 |
Europe | 77.8 |  |  | 48.5 |  |  | 184.9 |  |  | 141.5 |
South America | 15.3 |  |  | 16.7 |  |  | 39.2 |  |  | 48.4 |
Middle East and Asia | 7,303.8 |  |  | 6,620.0 |  |  | 19,929.7 |  |  | 20,191.0 |
Other | 1.3 |  |  | 1.2 |  |  | 5.2 |  |  | 3.1 |
Total revenues | $ | 7,873.0 |  |  | $ | 7,118.3 |  |  | $ | 21,617.4 |  |  | $ | 21,543.9 |

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