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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, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Unconsolidated VIE Net Assets $ 2,378.2 $ 2,282.1
Carrying Value and Maximum Exposure to Loss $ 0.9 $ 0.9