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Condensed Parent Only Financial Statements - Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | $ 8.2 | $ 7.2 | $ 7.3
Bad debts and impairments |  |  |  |  | 4.4 | 7.3 | 5.5
Deferred income taxes |  |  |  |  | (0.8) | 5.0 | (5.7)
Amortization of debt issuance costs and debt discount |  |  |  |  | 1.1 | 0.9 | 1.0
Amortization of share-based compensation expense |  |  |  |  | 5.1 | 3.6 | 4.3
Gain on acquisition | $ (6.2) | $ 0.0 | $ 0.0 | $ 0.0 | (6.2) | 0.0 | 0.0
Deposits and receivables from broker-dealers, clearing organizations, and counterparties |  |  |  |  | 135.7 | (150.2) | 1.1
Receivables from subsidiaries, net |  |  |  |  | (3.1) | 0.0 | 0.0
Notes receivable, net |  |  |  |  | 59.5 | (14.5) | (27.9)
Income taxes receivable |  |  |  |  | 8.2 | 0.0 | 4.2
Financial instruments owned, at fair value |  |  |  |  | (192.9) | (565.0) | (42.6)
Other assets |  |  |  |  | (17.4) | (16.2) | 0.1
Accounts payable and other accrued liabilities |  |  |  |  | 7.5 | 23.2 | 1.9
Payable to customers |  |  |  |  | 172.2 | 332.1 | 191.5
Financial instruments sold, not yet purchased, at fair value |  |  |  |  | 273.9 | 177.5 | 84.1
Net cash (used in) provided by operating activities |  |  |  |  | (27.8) | 37.9 | 132.6
Purchase of property and equipment |  |  |  |  | (15.4) | (9.1) | (4.3)
Net cash used in investing activities |  |  |  |  | (35.5) | (15.5) | (4.3)
Payable to lenders under loans |  |  |  |  | 142.0 | 15.5 | (38.5)
Proceeds from notes payable |  |  |  |  | 0.0 | 4.0 | 0.0
Payments of notes payable |  |  |  |  | (0.8) | (0.4) | 0.0
Payments related to earn-outs on acquisitions |  |  |  |  | (2.9) | (2.2) | (1.6)
Share repurchase |  |  |  |  | (19.5) | (4.7) | (9.7)
Debt issuance costs |  |  |  |  | (2.1) | (0.2) | (0.3)
Exercise of stock options |  |  |  |  | 3.5 | 2.5 | 1.4
Income tax benefit on stock options and awards |  |  |  |  | 0.8 | 0.5 | (0.1)
Net cash provided by (used in) financing activities |  |  |  |  | 121.0 | 15.0 | (48.8)
Net (decrease) increase in cash and cash equivalents |  |  |  |  | 48.1 | 36.8 | 75.2
Cash and cash equivalents at beginning of period |  |  |  | 268.1 | 268.1 | 231.3 | 156.1
Cash and cash equivalents at end of period | 316.2 |  |  |  | 316.2 | 268.1 | 231.3
Cash paid for interest |  |  |  |  | 26.0 | 15.8 | 9.6
Income taxes (received) paid, net of cash refunds |  |  |  |  | 8.5 | 15.3 | 3.0
Additional consideration payable related to acquisitions |  |  |  |  | (0.4) | 1.9 | (1.8)
Parent Company [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Net loss |  |  |  |  | (3.4) | (27.7) | (26.2)
Depreciation and amortization |  |  |  |  | 2.5 | 1.8 | 1.8
Bad debts and impairments |  |  |  |  | 0.2 | 1.6 | 0.1
Deferred income taxes |  |  |  |  | (3.3) | 4.6 | (9.6)
Amortization of debt issuance costs and debt discount |  |  |  |  | 1.0 | 0.8 | 0.8
Amortization of share-based compensation expense |  |  |  |  | 5.1 | 3.6 | 4.3
Gain on acquisition |  |  |  |  | (6.2) | 0.0 | 0.0
Deposits and receivables from broker-dealers, clearing organizations, and counterparties |  |  |  |  | 2.8 | 0.0 | 0.0
Due to/from subsidiaries |  |  |  |  | (86.6) | 33.2 | 84.6
Notes receivable, net |  |  |  |  | 39.1 | (7.8) | (12.8)
Income taxes receivable |  |  |  |  | 10.3 | (11.4) | 4.6
Financial instruments owned, at fair value |  |  |  |  | 1.7 | (3.0) | 0.0
Other assets |  |  |  |  | 0.3 | (3.9) | (1.1)
Accounts payable and other accrued liabilities |  |  |  |  | 0.4 | 12.6 | (1.1)
Payable to customers |  |  |  |  | (26.1) | 4.9 | 7.1
Financial instruments sold, not yet purchased, at fair value |  |  |  |  | 35.9 | 0.0 | (0.6)
Net cash (used in) provided by operating activities |  |  |  |  | (35.0) | 9.3 | 51.9
Capital contribution in affiliates |  |  |  |  | (48.4) | (22.4) | (0.5)
Capital withdrawals from affiliates |  |  |  |  | 0.0 | 7.8 | 0.0
Purchase of property and equipment |  |  |  |  | (5.5) | (7.8) | (1.8)
Net cash used in investing activities |  |  |  |  | (53.9) | (22.4) | (2.3)
Payable to lenders under loans |  |  |  |  | 108.5 | 13.0 | (40.0)
Payments related to earn-outs on acquisitions |  |  |  |  | (2.9) | (2.2) | (1.1)
Share repurchase |  |  |  |  | (19.5) | (4.7) | (9.7)
Debt issuance costs |  |  |  |  | (1.9) | (0.1) | (0.2)
Exercise of stock options |  |  |  |  | 3.5 | 2.5 | 1.4
Income tax benefit on stock options and awards |  |  |  |  | 0.8 | 0.5 | (0.1)
Net cash provided by (used in) financing activities |  |  |  |  | 87.7 | 12.6 | (49.7)
Net (decrease) increase in cash and cash equivalents |  |  |  |  | (1.2) | (0.5) | (0.1)
Cash and cash equivalents at beginning of period |  |  |  | $ 2.5 | 2.5 | 3.0 | 3.1
Cash and cash equivalents at end of period | $ 1.3 |  |  |  | 1.3 | 2.5 | 3.0
Cash paid for interest |  |  |  |  | 9.0 | 11.9 | 6.9
Income taxes (received) paid, net of cash refunds |  |  |  |  | (33.8) | (12.9) | (5.3)
Additional consideration payable related to acquisitions |  |  |  |  | $ (0.4) | $ 1.9 | $ (3.0)

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The net cash inflow or outflow associated with the aggregate amount of adjustment to the purchase price of a previous acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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