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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,523.6	$ 2,648.7	$ 2,689.2
Equity method investments in Affiliates (net)	2,288.5	2,139.5
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Goodwill	1,323.3	1,262.4
Definite-lived acquired client relationships (net)	652.5	479.4
Indefinite-lived acquired client relationships (net)	122.6	119.0
Undistributed earnings and tangible capital	190.1	278.7
Equity method investments in Affiliates (net)	$ 2,288.5	$ 2,139.5	$ 2,134.4

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