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Commitments and Contingencies - Schedule of Company's Restricted Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items] |  |
Pledged Financial Instruments, Not Separately Reported, Securities for Intercompany Reinsurance Agreements | $ 660.8 | $ 707.1
Pledged Financial Instruments, Not Separately Reported, Securities for Third-Party Agreements | 2,714.4 | 2,817.7
Pledged Financial Instruments, Not Separately Reported Securities for Letter of Credit Facility | 172.0 | 471.3
Restricted assets, excluding illiquid assets | 3,547.2 | 3,996.1
Other investments, at fair value (2) | 209.3 | 221.3
Debt Securities, Available for Sale and Held for Trading, and Illiquid Assets, Restricted | $ 3,756.5 | $ 4,217.4
Total as percent of investable assets | 50.20% | 59.40%

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