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Condensed Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading gains, net |  |  |  |  |  |  |  |  | $ 332.2 | $ 321.2 | $ 328.6
Consulting fees |  |  |  |  |  |  |  |  | 283.4 | 224.3 | 192.5
Interest income |  |  |  |  |  |  |  |  | 69.7 | 55.2 | 39.4
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 52.7 | 31.0 | 6.0
Operating revenues | $ 205.1 | $ 197.6 | $ 195.8 | $ 185.5 | $ 178.6 | $ 175.0 | $ 166.1 | $ 151.3 | 784.0 | 671.0 | 624.3
Interest expense | 12.0 | 11.2 | 10.0 | 8.9 | 7.5 | 7.7 | 7.1 | 6.0 | 42.1 | 28.3 | 17.1
Net operating revenues | 131.1 | 123.3 | 123.9 | 114.3 | 111.0 | 117.3 | 112.9 | 102.7 | 492.6 | 443.9 | 431.8
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits | 73.0 | 75.5 | 76.6 | 70.6 | 66.2 | 69.4 | 65.2 | 63.1 | 295.7 | 263.9 | 251.1
Clearing and related expenses | 35.1 | 33.9 | 33.7 | 33.6 | 32.0 | 35.2 | 32.9 | 29.8 | 136.3 | 129.9 | 122.7
Introducing broker commissions | 26.9 | 29.2 | 28.2 | 28.7 | 28.1 | 14.8 | 13.2 | 12.8 | 113.0 | 68.9 | 52.7
Communication and data services |  |  |  |  |  |  |  |  | 39.4 | 32.7 | 28.1
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 15.2 | 13.3 | 13.5
Professional fees |  |  |  |  |  |  |  |  | 15.2 | 14.0 | 12.5
Travel and business development |  |  |  |  |  |  |  |  | 13.3 | 11.5 | 10.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 9.8 | 8.2 | 7.2
Bad debts | 0.4 | 0.1 | 1.3 | 2.5 | (0.2) | 0.0 | 2.6 | 2.0 | 4.3 | 4.4 | 7.3
Other | 33.2 | 32.7 | 31.7 | 32.8 | 32.0 | 26.5 | 25.1 | 25.5 | 37.5 | 29.4 | 23.5
Total non-interest expenses | 153.6 | 108.3 | 109.6 | 105.9 | 98.0 | 95.9 | 92.9 | 90.6 | 477.4 | 377.4 | 353.7
Gain on acquisition |  |  |  |  | 6.2 | 0.0 | 0.0 | 0.0 | 0.0 | 6.2 | 0.0
Loss from continuing operations, before tax | 22.5 | (15.0) | (14.3) | (8.4) | (19.2) | (21.4) | (20.0) | (12.1) | (15.2) | (72.7) | (78.1)
Income tax benefit | $ (1.1) | $ (2.3) | $ (3.3) | $ (2.1) | $ (2.4) | $ (6.8) | $ (5.5) | $ (3.3) | (8.8) | (18.0) | (22.4)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Management fees from affiliates |  |  |  |  |  |  |  |  | 39.1 | 30.1 | 26.6
Trading gains, net |  |  |  |  |  |  |  |  | (1.0) | 0.7 | 3.2
Consulting fees |  |  |  |  |  |  |  |  | 0.0 | 2.2 | 2.1
Interest income |  |  |  |  |  |  |  |  | 1.2 | 1.8 | 4.6
Operating revenues |  |  |  |  |  |  |  |  | 92.0 | 65.8 | 42.5
Interest expense |  |  |  |  |  |  |  |  | 14.4 | 13.4 | 12.7
Net operating revenues |  |  |  |  |  |  |  |  | 77.6 | 52.4 | 29.8
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 60.3 | 52.8 | 43.5
Clearing and related expenses |  |  |  |  |  |  |  |  | 1.2 | 1.7 | 1.2
Introducing broker commissions |  |  |  |  |  |  |  |  | 0.0 | 0.6 | 0.5
Communication and data services |  |  |  |  |  |  |  |  | 7.3 | 6.7 | 5.7
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 2.5 | 2.8 | 2.1
Professional fees |  |  |  |  |  |  |  |  | 3.7 | 4.8 | 4.6
Travel and business development |  |  |  |  |  |  |  |  | 2.7 | 1.7 | 1.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.3 | 2.5 | 1.8
Bad debts |  |  |  |  |  |  |  |  | 0.0 | 0.2 | 1.6
Management services fee to affiliates |  |  |  |  |  |  |  |  | 0.0 | 1.2 | 4.3
Other |  |  |  |  |  |  |  |  | 13.0 | 11.7 | 10.2
Total non-interest expenses |  |  |  |  |  |  |  |  | 94.0 | 86.7 | 76.9
Gain on acquisition |  |  |  |  |  |  |  |  | 0.0 | 6.2 | 0.0
Loss from continuing operations, before tax |  |  |  |  |  |  |  |  | 16.4 | 28.1 | 47.1
Income tax benefit |  |  |  |  |  |  |  |  | 26.8 | 24.7 | 19.4
Net loss |  |  |  |  |  |  |  |  | 10.4 | (3.4) | (27.7)
Adjustment to Investment in Subs for Equity Method Accounting |  |  |  |  |  |  |  |  | $ 4.0 | $ 58.1 | $ 83.4

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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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