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Revenue from Contracts with Clients - Narrative (Details) | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |  |
Total revenues (percentage) | 6.40% | 2.80%

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- Definition Revenues From Contracts With Clients % Of Total Revenues + References No definition available. + Details
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