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Revenue from Contracts with Clients Disaggregation of Revenues Table (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | $ 85,100,000 | $ 106,400,000 | $ 184,600,000 | $ 192,900,000
Underwriting Income (Loss) | 200,000 | 700,000 | 500,000 | 1,300,000
Asset Management Fees | 6,000,000 | 6,400,000 | 12,200,000 | 12,500,000
Investment Advisory Fees | 4,700,000 | 4,800,000 | 9,700,000 | 9,400,000
Consulting,management, and account fees | 19,100,000.0 | 18,400,000.0 | 38,200,000.0 | 35,000,000.0
Revenue from Contract with Customer, Including Assessed Tax | 104,200,000 | 124,800,000 | 222,800,000 | 227,900,000
Sales of physical commodities | 6,929,500,000 | 6,255,800,000 | 13,225,300,000 | 13,970,200,000
Principal gains, net | 110,300,000 | 98,500,000 | 203,100,000 | 175,600,000
Interest income | 48,200,000 | 27,900,000 | 93,200,000 | 51,900,000
Revenues | 7,192,200,000 | 6,507,000,000 | 13,744,400,000 | 14,425,600,000
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 83,000,000 | 103,900,000 | 179,700,000 | 187,200,000
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 21,200,000 | 20,900,000 | 43,100,000 | 40,700,000
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 456,600,000 | 404,100,000 | 983,600,000 | 728,000,000
Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 53,800,000 | 47,800,000 | 107,100,000 | 93,000,000
South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12,400,000 | 16,700,000 | 23,900,000 | 31,700,000
Middle East and Asia [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,667,300,000 | 6,037,400,000 | 12,625,900,000 | 13,571,000,000
Other (geographic location) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,100,000 | 1,000,000 | 3,900,000 | 1,900,000
Precious Metals Trading Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales of physical commodities | 6,660,900,000 | 6,031,600,000 | 12,616,400,000 | 13,563,500,000
Physical Commodity Origination and Merchandising [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales of physical commodities | 268,600,000 | 224,200,000 | 608,900,000 | 406,700,000
Sales Based Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales Commissions and Fees | 46,000,000 | 58,700,000 | 101,500,000 | 107,700,000
Sales Based Commissions [Domain] | Exhange-Traded Futures and Options [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 31,200,000 | 44,000,000 | 70,300,000 | 78,600,000
Sales Based Commissions [Domain] | OTC Derivative Brokerage [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Brokerage Commissions Revenue | 7,300,000 | 8,300,000 | 16,200,000 | 15,800,000
Sales Based Commissions [Domain] | Equities and Fixed Income Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 3,600,000 | 2,800,000 | 6,800,000 | 5,600,000
Sales Based Commissions [Domain] | Mutual Fund Sales Based Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 1,900,000 | 2,100,000 | 4,500,000 | 4,100,000
Sales Based Commissions [Domain] | Variable Annuity [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 1,500,000 | 1,500,000 | 3,000,000 | 3,000,000
Sales Based Commissions [Domain] | Other Sales Based Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 500,000 | 0 | 700,000 | 600,000
Trailing Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 6,400,000 | 7,000,000 | 13,300,000 | 13,900,000
Trailing Commissions [Domain] | Variable Annuity [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 3,400,000 | 3,700,000 | 7,100,000 | 7,300,000
Trailing Commissions [Domain] | Mutual Fund Trailing Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Commission and clearing fees | 3,000,000 | 3,300,000 | 6,200,000 | 6,600,000
Clearing Fees [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Clearing Fees Revenue | 26,800,000 | 34,500,000 | 59,400,000 | 59,500,000
Trade Conversion Fees [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 3,300,000 | 2,000,000 | 4,900,000 | 3,800,000
Other Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 2,600,000 | 4,200,000 | 5,500,000 | 8,000,000
Consulting, management, and account fees [Domain] | Sweep Program Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consulting,management, and account fees | 4,100,000.0 | 2,700,000.0 | 7,900,000.0 | 4,900,000.0
Consulting, management, and account fees [Domain] | Client Account Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consulting,management, and account fees | 2,500,000.0 | 2,900,000.0 | 5,200,000.0 | 5,700,000.0
Consulting, management, and account fees [Domain] | Other Consulting, Management, and Account Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consulting,management, and account fees | $ 1,600,000.0 | $ 900,000.0 | $ 2,700,000.0 | $ 1,200,000.0

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