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Condensed Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading gains, net |  |  |  |  |  |  |  |  | $ 389.1 | $ 332.2 | $ 321.2
Consulting fees |  |  |  |  |  |  |  |  | 356.8 | 283.4 | 224.3
Interest income |  |  |  |  |  |  |  |  | 123.3 | 69.7 | 55.2
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 41.9 | 52.7 | 31.0
Operating revenues | $ 243.2 | $ 259.8 | $ 260.2 | $ 212.6 | $ 205.1 | $ 197.6 | $ 195.8 | $ 185.5 | 975.8 | 784.0 | 671.0
Interest expense | 25.3 | 22.1 | 19.0 | 14.3 | 12.0 | 11.2 | 10.0 | 8.9 | 80.7 | 42.1 | 28.3
Net operating revenues | 142.4 | 154.6 | 154.3 | 130.3 | 131.1 | 123.3 | 123.9 | 114.3 | 581.6 | 492.6 | 443.9
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits | 85.4 | 86.9 | 88.2 | 77.2 | 73.0 | 75.5 | 76.6 | 70.6 | 337.7 | 295.7 | 263.9
Clearing and related expenses | 43.1 | 49.0 | 50.7 | 36.9 | 35.1 | 33.9 | 33.7 | 33.6 | 179.7 | 136.3 | 129.9
Introducing broker commissions | 32.4 | 34.1 | 36.2 | 31.1 | 26.9 | 29.2 | 28.2 | 28.7 | 133.8 | 113.0 | 68.9
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 16.5 | 15.2 | 13.3
Professional fees |  |  |  |  |  |  |  |  | 18.1 | 15.2 | 14.0
Travel and business development |  |  |  |  |  |  |  |  | 13.8 | 13.3 | 11.5
Non-trading technology and support |  |  |  |  |  |  |  |  | 13.9 | 11.6 | 7.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 11.6 | 9.8 | 8.2
Communications |  |  |  |  |  |  |  |  | 5.4 | 5.0 | 4.7
Bad debts | 1.2 | 1.6 | 0.2 | 0.1 | 0.4 | 0.1 | 1.3 | 2.5 | 3.1 | 4.3 | 4.4
Other | 35.3 | 35.2 | 36.4 | 33.4 | 33.2 | 32.7 | 31.7 | 32.8 | 26.3 | 25.9 | 22.3
Total non-interest expenses | 121.9 | 123.7 | 124.8 | 111.7 | 153.6 | 108.3 | 109.6 | 105.9 | 482.1 | 477.4 | 377.4
Loss from continuing operations, before tax | (20.5) | (32.9) | (29.5) | (18.6) | 22.5 | (15.0) | (14.3) | (8.4) | (101.5) | (15.2) | (72.7)
Income tax benefit | $ (4.8) | $ (8.9) | $ (6.8) | $ (25.5) | $ (1.1) | $ (2.3) | $ (3.3) | $ (2.1) | (46.0) | (8.8) | (18.0)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Management fees from affiliates |  |  |  |  |  |  |  |  | 40.4 | 39.1 | 30.1
Trading gains, net |  |  |  |  |  |  |  |  | 0.0 | (1.0) | 0.7
Consulting fees |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 2.2
Interest income |  |  |  |  |  |  |  |  | 2.3 | 1.2 | 1.8
Operating revenues |  |  |  |  |  |  |  |  | 84.6 | 92.0 | 65.8
Interest expense |  |  |  |  |  |  |  |  | 15.7 | 14.4 | 13.4
Net operating revenues |  |  |  |  |  |  |  |  | 68.9 | 77.6 | 52.4
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 73.0 | 60.3 | 52.8
Clearing and related expenses |  |  |  |  |  |  |  |  | 1.1 | 1.2 | 1.7
Introducing broker commissions |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.6
Communication and data services |  |  |  |  |  |  |  |  | 5.8 | 6.4 | 5.6
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 2.6 | 2.5 | 2.8
Professional fees |  |  |  |  |  |  |  |  | 6.7 | 3.7 | 4.8
Travel and business development |  |  |  |  |  |  |  |  | 2.6 | 2.7 | 1.7
Non-trading technology and support |  |  |  |  |  |  |  |  | 9.1 | 7.4 | 4.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 4.8 | 3.3 | 2.5
Communications |  |  |  |  |  |  |  |  | 0.9 | 0.9 | 1.1
Bad debts |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.2
Management services fee to affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.2
Other |  |  |  |  |  |  |  |  | 6.9 | 5.6 | 7.0
Total non-interest expenses |  |  |  |  |  |  |  |  | 113.5 | 94.0 | 86.7
Gain on acquisition |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 6.2
Loss from continuing operations, before tax |  |  |  |  |  |  |  |  | 44.6 | 16.4 | 28.1
Income tax benefit |  |  |  |  |  |  |  |  | 7.4 | 26.8 | 24.7
Net loss |  |  |  |  |  |  |  |  | (37.2) | 10.4 | (3.4)
Adjustment to Investment in Subs for Equity Method Accounting |  |  |  |  |  |  |  |  | $ 92.7 | $ 4.0 | $ 58.1

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- Definition Expenses incurred for travel and entertainment during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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