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Investments in Affiliates and Affiliate Sponsored Investment Products - Affiliated Accounted For Under Equity Method (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Variable Interest Entity [Line Items] |  |
Carrying value of equity method investment in affiliate | $ 2,134.4 | $ 2,074.8
Carrying amount and maximum exposure to loss equity method investments considered VREs | 111.4 | 112.7
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Unconsolidated VIE Net Assets | 1,864.7 | 1,384.2
Carrying Value and Maximum Exposure to Loss | $ 2,023.0 | $ 1,962.1

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