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Borrowings - Broker-Dealer Credit Facilities, Narrative (Details) | Nov. 03, 2017 USD ($) borrowing_base broker_dealer | Mar. 31, 2019 USD ($) debt_instrument broker_dealer | Mar. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 02, 2017 USD ($)
--- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |
Number of borrowing bases | borrowing_base | 2 |  |  |  |
Number of broker-dealer subsidiaries | broker_dealer | 3 | 5 |  |  |
Broker-dealer credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Number of secured credit facilities | debt_instrument |  | 2 |  |  |
Aggregate borrowing | $ 500,000,000 | $ 800,000,000 | $ 600,000,000 | $ 700,000,000 |
Commitment fee (as a percent) | 0.50% |  |  |  |
Broker-dealer credit facility on an uncommitted basis |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Number of secured credit facilities | debt_instrument |  | 1 |  |  |
Maximum borrowing capacity |  | $ 200,000,000 |  |  |
Aggregate borrowing |  | $ 200,000,000 |  | $ 200,000,000 |
Borrowing Base A Loan | Broker-dealer credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 600,000,000 |  |  |  | $ 400,000,000
Borrowing Base A Loan | Broker-dealer credit facilities | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate margin (as a percent) | 1.25% |  |  |  |
Borrowing Base B Loan | Broker-dealer credit facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 150,000,000 |  |  |  | $ 40,000,000
Borrowing Base B Loan | Broker-dealer credit facilities | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate margin (as a percent) | 2.50% |  |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The number of borrowing bases for a credit facility. + References No definition available. + Details
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- Definition Represents the number of broker-dealer subsidiaries of the entity. + References No definition available. + Details
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- Definition Represents the number of secured credit facilities. + References No definition available. + Details
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- Details
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