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Investments in Affiliates and Affiliate Sponsored Investment Products - Affiliated Accounted For Under Equity Method (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entities    
Carrying value of equity method investment in affiliate $ 2,046.8 $ 2,134.4
Carrying amount and maximum exposure to loss equity method investments considered VREs 95.5 111.4
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entities    
Unconsolidated VIE Net Assets 1,558.4 1,864.7
Carrying Value and Maximum Exposure to Loss $ 1,951.3 $ 2,023.0