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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,532.0	$ 2,523.6
Equity method investments in Affiliates (net)	2,148.4	2,288.5
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Goodwill	1,348.1	1,323.3
Definite-lived acquired client relationships (net)	568.1	652.5
Indefinite-lived acquired client relationships (net)	122.4	122.6
Undistributed earnings and tangible capital	109.8	190.1
Equity method investments in Affiliates (net)	$ 2,148.4	$ 2,288.5

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