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Legal Proceedings (Details) |  | 1 Months Ended
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Mar. 04, 2019 retirement_and_benefit_fund | Jan. 31, 2019 lawsuit multinational_bank municipal_pension_fund
Commitments and Contingencies Disclosure [Abstract] |  |
Number of class action lawsuits | lawsuit |  | 2
Number of retirement and benefit funds | municipal_pension_fund |  | 2
Number of multinational banks | multinational_bank |  | 18
Number of retirement and benefit funds | retirement_and_benefit_fund | 4 |

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