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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	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entities
Unconsolidated VIE Net Assets	$ 5,016.5	$ 5,788.3
Carrying Value and Maximum Exposure to Loss	$ 21.7	$ 29.8

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