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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 | Jun. 30, 2021 | Dec. 31, 2020
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Variable Interest Entities |  |
Unconsolidated VIE Net Assets | $ 2,960.8 | $ 2,378.2
Carrying Value and Maximum Exposure to Loss | $ 13.1 | $ 0.9

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