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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,504.9	$ 2,523.6	$ 2,648.7
Equity method investments in Affiliates (net)	2,246.6	2,288.5
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Goodwill	1,363.2	1,323.3
Definite-lived acquired client relationships, net	546.1	652.5
Indefinite-lived acquired client relationships, net	124.1	122.6
Undistributed earnings and tangible capital	213.2	190.1
Equity method investments in Affiliates (net)	$ 2,246.6	$ 2,288.5	$ 2,139.5

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