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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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