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Commitments and Contingencies - Narrative (Details) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2019 lawsuit multinational_bank municipal_pension_fund | Dec. 31, 2014 institution lawsuit
Commitments and Contingencies Disclosure [Abstract] |  |
Number of financial institutions | institution |  | 40
Number of class action lawsuits | lawsuit | 2 | 4
Number of municipal pension funds | municipal_pension_fund | 2 |
Number of multinational banks | multinational_bank | 18 |

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