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Investments in Affiliates and Affiliate Sponsored Investment Products - Affiliated Sponsored Investment Products (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Variable Interest Entities |  |
Unconsolidated VIE Net Assets | $ 5,332.2 | $ 5,788.3
Carrying Value and Maximum Exposure to Loss | $ 24.4 | $ 29.8

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