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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,517.5	$ 2,523.6
Equity method investments in Affiliates (net)	2,214.1	2,288.5
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Goodwill	1,369.3	1,323.3
Definite-lived acquired client relationships (net)	617.7	652.5
Indefinite-lived acquired client relationships (net)	122.6	122.6
Undistributed earnings and tangible capital	104.5	190.1
Equity method investments in Affiliates (net)	$ 2,214.1	$ 2,288.5

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