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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, 2025	Dec. 31, 2024
Variable Interest Entities
Unconsolidated VIE Net Assets	$ 8,744.9	$ 5,925.0
Carrying Value and Maximum Exposure to Loss	$ 86.5	$ 28.0

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