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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Ria Operations [Member] | Foreign Exchange Contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative Asset, Notional Amount | $ 213.0 |
Corporate Operations [Member] | Foreign Exchange Contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative Asset, Notional Amount | 193.0 |
HiFX Operations [Member] | Foreign Exchange Contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative Asset, Notional Amount | $ 1,500.0 |
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 | $ 18.1 | $ 18.6

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + 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=121590274&loc=SL5624186-113959 + Details
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