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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 | Dec. 31, 2020 | Dec. 31, 2019
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Variable Interest Entity [Line Items] |  |
Unconsolidated VIE Net Assets | $ 2,378.2 | $ 2,282.1
Carrying Value and Maximum Exposure to Loss | $ 0.9 | $ 0.9

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