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Investments in Affiliates and Affiliate Sponsored Investment Products - Affiliated Accounted For Under Equity Method (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Carrying value of equity method investment in affiliate $ 2,139.5 $ 2,134.4
Carrying amount and maximum exposure to loss equity method investments considered VREs 87.9 111.4
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Unconsolidated VIE Net Assets 1,273.5 1,864.7
Carrying Value and Maximum Exposure to Loss $ 2,051.6 $ 2,023.0