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Investments - Pledged Investments and Reverse Repurchase Agreements (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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 $ 7,900.0 $ 8,700.0
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities 1,200.0 1,800.0
Reverse repurchase agreements $ 38.5 $ 5.1
Minimum percentage of collateral required 102.00%