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Condensed Parent Only Financial Statements - Cash Flows (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 | Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 11.6 | $ 9.8 | $ 8.2 |
Bad debts | $ 1.2 | $ 1.6 | $ 0.2 | $ 0.1 | $ 0.4 | $ 0.1 | $ 1.3 | $ 2.5 | 3.1 | 4.3 | 4.4 |
Deferred income taxes |  |  |  |  |  |  |  |  | 22.3 | (9.8) | (0.8) |
Amortization and extinguishment of debt issuance costs |  |  |  |  |  |  |  |  | 1.0 | 1.9 | 1.1 |
Amortization of share-based compensation expense |  |  |  |  |  |  |  |  | 6.6 | 6.3 | 5.1 |
Deposits and receivables from broker-dealers, clearing organizations, and counterparties |  |  |  |  |  |  |  |  | 408.8 | (889.1) | 146.6 |
Receivables from subsidiaries, net |  |  |  |  |  |  |  |  | (0.8) | (0.3) | (3.1) |
Notes receivable, net |  |  |  |  |  |  |  |  | 6.8 | 8.3 | 59.5 |
Income taxes receivable |  |  |  |  |  |  |  |  | (1.3) | 0.5 | 8.2 |
Financial instruments owned, at fair value |  |  |  |  |  |  |  |  | (308.7) | (125.6) | (192.9) |
Other assets |  |  |  |  |  |  |  |  | (3.3) | (16.0) | (17.4) |
Accounts payable and other accrued liabilities |  |  |  |  |  |  |  |  | 18.6 | (19.6) | 7.5 |
Payable to customers |  |  |  |  |  |  |  |  | 520.0 | 290.9 | 172.2 |
Financial instruments sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  | 153.9 | (124.4) | 273.9 |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | (74.0) | 13.9 | (27.8) |
Purchase of property and equipment |  |  |  |  |  |  |  |  | (12.5) | (16.1) | (15.4) |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (15.4) | (22.3) | (35.5) |
Payable to lenders under loans |  |  |  |  |  |  |  |  | 125.8 | 48.2 | 142.0 |
Payments of notes payable |  |  |  |  |  |  |  |  | (0.8) | (0.8) | (0.8) |
Payments related to earn-outs on acquisitions |  |  |  |  |  |  |  |  | (5.5) | 0.0 | (2.9) |
Share repurchase |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (19.5) |
Debt issuance costs |  |  |  |  |  |  |  |  | (0.4) | (0.3) | (2.1) | $ (1.7)
Exercise of stock options |  |  |  |  |  |  |  |  | 2.6 | 3.4 | 3.5 |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  | (0.8) | 0.0 | 0.0 |
Income tax benefit on stock options and awards |  |  |  |  |  |  |  |  | 0.0 | 0.7 | 0.8 |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 120.9 | 5.7 | 121.0 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  | 27.4 | (1.3) | 48.1 |
Cash and cash equivalents at beginning of period |  |  |  | 314.9 |  |  |  | 316.2 | 314.9 | 316.2 | 268.1 |
Cash and cash equivalents at end of period | 342.3 |  |  |  | 314.9 |  |  |  | 342.3 | 314.9 | 316.2 |
Cash paid for interest |  |  |  |  |  |  |  |  | 78.9 | 38.0 | 26.0 |
Income taxes (received) paid, net of cash refunds |  |  |  |  |  |  |  |  | 22.2 | 17.1 | 8.5 |
Additional consideration payable related to acquisitions |  |  |  |  |  |  |  |  | 0.0 | (0.2) | (0.4) |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | (37.2) | 10.4 | (3.4) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 4.8 | 3.3 | 2.5 |
Bad debts |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.2 |
Deferred income taxes |  |  |  |  |  |  |  |  | 18.0 | (10.7) | (3.3) |
Amortization and extinguishment of debt issuance costs |  |  |  |  |  |  |  |  | 0.7 | 1.7 | 1.0 |
Amortization of share-based compensation expense |  |  |  |  |  |  |  |  | 6.1 | 5.5 | 5.1 |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 6.2 |
Deposits and receivables from broker-dealers, clearing organizations, and counterparties |  |  |  |  |  |  |  |  | 0.0 | (2.9) | 2.8 |
Due to/from subsidiaries |  |  |  |  |  |  |  |  | (68.6) | 27.0 | (86.6) |
Notes receivable, net |  |  |  |  |  |  |  |  | 2.9 | 2.1 | 39.1 |
Income taxes receivable |  |  |  |  |  |  |  |  | (6.6) | 5.4 | 10.3 |
Financial instruments owned, at fair value |  |  |  |  |  |  |  |  | (4.4) | 1.3 | 1.7 |
Other assets |  |  |  |  |  |  |  |  | (0.7) | 7.8 | 0.3 |
Accounts payable and other accrued liabilities |  |  |  |  |  |  |  |  | 8.6 | (7.8) | 0.4 |
Payable to customers |  |  |  |  |  |  |  |  | (0.3) | (2.5) | (26.1) |
Financial instruments sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  | 34.0 | (10.6) | 35.9 |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | (43.5) | 35.5 | (35.0) |
Capital contribution in affiliates |  |  |  |  |  |  |  |  | (4.5) | 0.0 | (48.4) |
Purchase of property and equipment |  |  |  |  |  |  |  |  | (5.9) | (6.1) | (5.5) |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (10.4) | (6.1) | (53.9) |
Payable to lenders under loans |  |  |  |  |  |  |  |  | 58.2 | 13.5 | 108.5 |
Proceeds from Issuance of Senior Long-term Debt |  |  |  |  |  |  |  |  | 0.0 | (45.5) | 0.0 |
Payments related to earn-outs on acquisitions |  |  |  |  |  |  |  |  | (5.5) | 0.0 | (2.9) |
Share repurchase |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (19.5) |
Debt issuance costs |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (1.9) |
Exercise of stock options |  |  |  |  |  |  |  |  | 2.6 | 3.4 | 3.5 |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  | (0.8) | 0.0 | 0.0 |
Income tax benefit on stock options and awards |  |  |  |  |  |  |  |  | 0.0 | 0.7 | 0.8 |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 53.7 | (28.7) | 87.7 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  | (0.2) | 0.7 | (1.2) |
Cash and cash equivalents at beginning of period |  |  |  | $ 2.0 |  |  |  | $ 1.3 | 2.0 | 1.3 | 2.5 |
Cash and cash equivalents at end of period | $ 1.8 |  |  |  | $ 2.0 |  |  |  | 1.8 | 2.0 | 1.3 |
Cash paid for interest |  |  |  |  |  |  |  |  | 15.0 | 8.2 | 9.0 |
Income taxes (received) paid, net of cash refunds |  |  |  |  |  |  |  |  | (18.4) | (22.3) | (33.8) |
Additional consideration payable related to acquisitions |  |  |  |  |  |  |  |  | $ 0.0 | $ (0.2) | $ (0.4) |

X
- Definition Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). In addition, it includes the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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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=98514028&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=98514028&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=98514028&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=98514028&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=98514028&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=98514028&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=98514028&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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: 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(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 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(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: 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=98514028&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=98514028&loc=d3e3291-108585 + 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=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: 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=98514028&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=98514028&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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + 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=98514028&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References No definition available. + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + 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 (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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=98514028&loc=d3e3602-108585 + Details
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