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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, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Unconsolidated VIE Net Assets	$ 5,788.3	$ 4,878.6
Carrying Value and Maximum Exposure to Loss	$ 29.8	$ 15.3

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Amount of net assets (liabilities).

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