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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
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