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Business Combinations - Assets Acquired and Liabilities & Equity Assumed (Details) - USD ($) $ in Thousands | Feb. 01, 2021 | Sep. 30, 2021 | Dec. 31, 2020
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |
Goodwill |  | $ 315,366 | $ 290,366
AllianzGI |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |
Total definite-lived intangible assets | $ 120,388 |  |
Goodwill | 25,000 |  |
Total assets acquired | 145,388 |  |
Open-end and closed-end fund investment contracts | AllianzGI |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |
Total definite-lived intangible assets | $ 101,447 |  |
Weighted Average Useful Life | 13 years |  |
Retail separate account investment contracts | AllianzGI |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |
Total definite-lived intangible assets | $ 17,000 |  |
Weighted Average Useful Life | 6 years |  |
Trade name | AllianzGI |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |
Total definite-lived intangible assets | $ 1,941 |  |
Weighted Average Useful Life | 8 years |  |

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