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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Ria Operations [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | $ 278.0 |  | $ 278.0 |
Corporate Operations [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 86.0 |  | 86.0 |
HiFX Operations [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 1,400.0 |  | $ 1,400.0 |
Maximum [Member] | Ria Operations [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Foreign currency forward contract term |  |  | 14 days |
Trading Revenue [Member] | HiFX Operations [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Foreign Currency Exchange Margin | $ 16.1 | $ 16.8 | $ 34.7 | $ 35.5

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + 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 The net gain on trading activities (including both derivative and nonderivative instruments) recognized in the statement of financial performance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959 + Details
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