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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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