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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, 2025
Dec. 31, 2024
Variable Interest Entities    
Unconsolidated VIE Net Assets $ 6,376.3 $ 5,925.0
Carrying Value and Maximum Exposure to Loss $ 33.7 $ 28.0