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Condensed Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading gains, net |  |  |  |  |  |  |  |  | $ 328.6 | $ 244.5 | $ 244.0
Consulting fees |  |  |  |  |  |  |  |  | 192.5 | 180.7 | 173.3
Interest income |  |  |  |  |  |  |  |  | 39.4 | 8.0 | 8.9
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 0.3 | 0.7 | 0.9
Operating revenues | $ 178.7 | $ 151.6 | $ 156.5 | $ 137.5 | $ 130.6 | $ 118.2 | $ 129.2 | $ 112.9 | 624.3 | 490.9 | 468.2
Interest expense | 5.0 | 4.9 | 4.5 | 2.7 | 2.5 | 2.5 | 2.8 | 2.7 | 17.1 | 10.5 | 7.9
Net operating revenues | 127.3 | 103.4 | 107.9 | 93.2 | 86.7 | 76.0 | 85.9 | 73.4 | 431.8 | 322.0 | 309.7
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 251.1 | 201.9 | 198.7
Clearing and related expenses | 31.3 | 30.2 | 31.8 | 29.4 | 27.5 | 28.1 | 27.7 | 25.2 | 122.7 | 108.5 | 110.1
Introducing broker commissions | 15.1 | 13.1 | 12.3 | 12.2 | 13.9 | 11.6 | 12.8 | 11.6 | 52.7 | 49.9 | 40.5
Communication and data services |  |  |  |  |  |  |  |  | 28.1 | 25.8 | 23.1
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 13.5 | 12.3 | 12.0
Professional fees |  |  |  |  |  |  |  |  | 12.5 | 14.9 | 12.4
Travel and business development |  |  |  |  |  |  |  |  | 10.5 | 9.9 | 10.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 7.2 | 7.3 | 8.0
Bad debts and impairments |  |  |  |  |  |  |  |  | 7.3 | 5.5 | 0.8
Other |  |  |  |  |  |  |  |  | 23.5 | 18.4 | 23.1
Total non-interest expenses | 98.1 | 86.2 | 89.8 | 79.6 | 78.9 | 72.0 | 75.6 | 69.5 | 353.7 | 296.0 | 288.5
Loss from continuing operations, before tax | (29.2) | (17.2) | (18.1) | (13.6) | (7.8) | (4.0) | (10.3) | (3.9) | (78.1) | (26.0) | (21.2)
Income tax benefit | $ (8.1) | $ (5.0) | $ (5.1) | $ (4.2) | $ (2.0) | $ (0.3) | $ (2.6) | $ (1.5) | (22.4) | (6.4) | (2.6)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Management fees from affiliates |  |  |  |  |  |  |  |  | 26.6 | 9.5 | 9.2
Trading gains, net |  |  |  |  |  |  |  |  | 3.2 | 0.0 | 0.0
Consulting fees |  |  |  |  |  |  |  |  | 2.1 | 1.6 | 1.6
Interest income |  |  |  |  |  |  |  |  | 4.6 | 4.3 | 3.6
Dividend income from subsidiaries |  |  |  |  |  |  |  |  | 6.0 | 0.0 | 0.0
Operating revenues |  |  |  |  |  |  |  |  | 42.5 | 15.4 | 14.4
Interest expense |  |  |  |  |  |  |  |  | 12.7 | 10.6 | 7.1
Net operating revenues |  |  |  |  |  |  |  |  | 29.8 | 4.8 | 7.3
Non-interest expenses: |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits |  |  |  |  |  |  |  |  | 43.5 | 29.8 | 30.5
Clearing and related expenses |  |  |  |  |  |  |  |  | 1.2 | 0.3 | 0.5
Introducing broker commissions |  |  |  |  |  |  |  |  | 0.5 | 0.3 | 0.5
Communication and data services |  |  |  |  |  |  |  |  | 5.7 | 1.3 | 0.9
Occupancy and equipment rental |  |  |  |  |  |  |  |  | 2.1 | 2.0 | 1.4
Professional fees |  |  |  |  |  |  |  |  | 4.6 | 5.0 | 2.3
Travel and business development |  |  |  |  |  |  |  |  | 1.4 | 1.1 | 1.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.8 | 1.8 | 1.5
Bad debts and impairments |  |  |  |  |  |  |  |  | 1.6 | 0.1 | 0.0
Management services fee to affiliates |  |  |  |  |  |  |  |  | 4.3 | 2.9 | 2.7
Other |  |  |  |  |  |  |  |  | 10.2 | 3.5 | 3.6
Total non-interest expenses |  |  |  |  |  |  |  |  | 76.9 | 48.1 | 45.1
Loss from continuing operations, before tax |  |  |  |  |  |  |  |  | 47.1 | 43.3 | 37.8
Income tax benefit |  |  |  |  |  |  |  |  | 19.4 | 17.1 | 13.2
Net loss |  |  |  |  |  |  |  |  | (27.7) | (26.2) | (24.6)
Adjustment to Investment in Subs for Equity Method Accounting |  |  |  |  |  |  |  |  | $ 83.4 | $ 45.5 | $ 43.9

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