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Investments in Affiliates and Affiliate Sponsored Investment Products - Affiliated Accounted For Under Equity Method (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Variable Interest Entity [Line Items] |  |
Carrying value of equity method investment in affiliate | $ 2,288.5 | $ 2,139.5
Carrying amount and maximum exposure to loss equity method investments considered VREs | 90.3 | 87.9
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Unconsolidated VIE Net Assets | 1,492.4 | 1,273.5
Carrying Value and Maximum Exposure to Loss | $ 2,198.2 | $ 2,051.6

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