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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,509.0	$ 2,648.7
Equity method investments in Affiliates (net)	2,034.9	2,139.5
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Goodwill	1,300.3	1,262.4
Definite-lived acquired client relationships (net)	525.7	479.4
Indefinite-lived acquired client relationships (net)	122.6	119.0
Undistributed earnings and tangible capital	86.3	278.7
Equity method investments in Affiliates (net)	$ 2,034.9	$ 2,139.5

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