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Condensed Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading gains, net |  |  |  |  |  |  |  |  | $ 321.2 | $ 328.6 | $ 244.5
Consulting fees |  |  |  |  |  |  |  |  | 224.3 | 192.5 | 180.7
Interest income |  |  |  |  |  |  |  |  | 55.2 | 39.4 | 8.0
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 31.0 | 6.0 | 0.0
Operating revenues | $ 178.6 | $ 175.0 | $ 166.1 | $ 151.3 | $ 178.7 | $ 151.6 | $ 156.5 | $ 137.5 | 671.0 | 624.3 | 490.9
Interest expense | 7.5 | 7.7 | 7.1 | 6.0 | 5.0 | 4.9 | 4.5 | 2.7 | 28.3 | 17.1 | 10.5
Net operating revenues | 111.0 | 117.3 | 112.9 | 102.7 | 127.3 | 103.4 | 107.9 | 93.2 | 443.9 | 431.8 | 322.0
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 263.9 | 251.1 | 201.9
Clearing and related expenses | 32.0 | 35.2 | 32.9 | 29.8 | 31.3 | 30.2 | 31.8 | 29.4 | 129.9 | 122.7 | 108.5
Introducing broker commissions | 28.1 | 14.8 | 13.2 | 12.8 | 15.1 | 13.1 | 12.3 | 12.2 | 68.9 | 52.7 | 49.9
Communication and data services |  |  |  |  |  |  |  |  | 32.7 | 28.1 | 25.8
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 13.3 | 13.5 | 12.3
Professional fees |  |  |  |  |  |  |  |  | 14.0 | 12.5 | 14.9
Travel and business development |  |  |  |  |  |  |  |  | 11.5 | 10.5 | 9.9
Depreciation and amortization |  |  |  |  |  |  |  |  | 8.2 | 7.2 | 7.3
Bad debts and impairments |  |  |  |  |  |  |  |  | 4.4 | 7.3 | 5.5
Other |  |  |  |  |  |  |  |  | 29.4 | 23.5 | 18.4
Total non-interest expenses | 98.0 | 95.9 | 92.9 | 90.6 | 98.1 | 86.2 | 89.8 | 79.6 | 377.4 | 353.7 | 296.0
Gain on acquisition | 6.2 | 0.0 | 0.0 | 0.0 |  |  |  |  | 6.2 | 0.0 | 0.0
Loss from continuing operations, before tax | (19.2) | (21.4) | (20.0) | (12.1) | (29.2) | (17.2) | (18.1) | (13.6) | (72.7) | (78.1) | (26.0)
Income tax benefit | $ (2.4) | $ (6.8) | $ (5.5) | $ (3.3) | $ (8.1) | $ (5.0) | $ (5.1) | $ (4.2) | (18.0) | (22.4) | (6.4)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Management fees from affiliates |  |  |  |  |  |  |  |  | 30.1 | 26.6 | 9.5
Trading gains, net |  |  |  |  |  |  |  |  | 0.7 | 3.2 | 0.0
Consulting fees |  |  |  |  |  |  |  |  | 2.2 | 2.1 | 1.6
Interest income |  |  |  |  |  |  |  |  | 1.8 | 4.6 | 4.3
Operating revenues |  |  |  |  |  |  |  |  | 65.8 | 42.5 | 15.4
Interest expense |  |  |  |  |  |  |  |  | 13.4 | 12.7 | 10.6
Net operating revenues |  |  |  |  |  |  |  |  | 52.4 | 29.8 | 4.8
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 52.8 | 43.5 | 29.8
Clearing and related expenses |  |  |  |  |  |  |  |  | 1.7 | 1.2 | 0.3
Introducing broker commissions |  |  |  |  |  |  |  |  | 0.6 | 0.5 | 0.3
Communication and data services |  |  |  |  |  |  |  |  | 6.7 | 5.7 | 1.3
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 2.8 | 2.1 | 2.0
Professional fees |  |  |  |  |  |  |  |  | 4.8 | 4.6 | 5.0
Travel and business development |  |  |  |  |  |  |  |  | 1.7 | 1.4 | 1.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 2.5 | 1.8 | 1.8
Bad debts and impairments |  |  |  |  |  |  |  |  | 0.2 | 1.6 | 0.1
Management services fee to affiliates |  |  |  |  |  |  |  |  | 1.2 | 4.3 | 2.9
Other |  |  |  |  |  |  |  |  | 11.7 | 10.2 | 3.5
Total non-interest expenses |  |  |  |  |  |  |  |  | 86.7 | 76.9 | 48.1
Gain on acquisition |  |  |  |  |  |  |  |  | 6.2 | 0.0 | 0.0
Loss from continuing operations, before tax |  |  |  |  |  |  |  |  | 28.1 | 47.1 | 43.3
Income tax benefit |  |  |  |  |  |  |  |  | 24.7 | 19.4 | 17.1
Net loss |  |  |  |  |  |  |  |  | (3.4) | (27.7) | (26.2)
Adjustment to Investment in Subs for Equity Method Accounting |  |  |  |  |  |  |  |  | $ 58.1 | $ 83.4 | $ 45.5

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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=26872669&loc=d3e20235-122688 + Details
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