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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Goodwill $ 2,683.7 $ 2,689.2
Equity method investments in Affiliates (net) 2,195.2 2,134.4
Equity Method Investee    
Schedule of Equity Method Investments [Line Items]    
Goodwill 1,360.3 1,264.4
Definite-lived acquired client relationships (net) 536.1 470.1
Indefinite-lived acquired client relationships (net) 174.5 174.4
Undistributed earnings and tangible capital 124.3 225.5
Equity method investments in Affiliates (net) $ 2,195.2 $ 2,134.4