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Equity Method Investments in Affiliates - Schedule of Equity Method Investments in Affiliates (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Goodwill | $ 2,648.9 | $ 2,648.7
Equity method investments in Affiliates (net) | 1,920.2 | 2,139.5
Equity Method Investee |  |
Schedule of Equity Method Investments [Line Items] |  |
Goodwill | 1,278.4 | 1,262.4
Definite-lived acquired client relationships (net) | 462.0 | 479.4
Indefinite-lived acquired client relationships (net) | 121.1 | 119.0
Undistributed earnings and tangible capital | 58.7 | 278.7
Equity method investments in Affiliates (net) | $ 1,920.2 | $ 2,139.5

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