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Investments - Pledged Investments and Reverse Repurchase Agreements (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of, various counterparties $ 10,500.0 $ 7,900.0
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities 2,900.0 1,200.0
Reverse repurchase agreements $ 159.7 $ 38.5