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Investments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Cash and cash equivalents $ 189.1 $ 131.7
Restricted Cash 2.5 1.8
Funds receivable and funds held on behalf of clients $ 1,394.0 $ 2,079.1