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Commitments and Contingencies - Schedule of Company's Restricted Assets (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]      
Pledged Financial Instruments, Not Separately Reported, Securities for Intercompany Reinsurance Agreements $ 478.0 $ 660.8 $ 707.1
Pledged Financial Instruments, Not Separately Reported, Securities for Third-Party Agreements 2,738.9 2,714.4 2,817.7
Pledged Financial Instruments, Not Separately Reported Securities for Letter of Credit Facility 140.0 172.0 471.3
Restricted assets, excluding illiquid assets 3,356.9 3,547.2 3,996.1
Other investments, at fair value 204.7 209.3 221.3
Debt Securities, Available for Sale and Held for Trading, and Illiquid Assets, Restricted $ 3,561.6 $ 3,756.5 $ 4,217.4
Total as percent of investable assets 46.00% 50.20% 59.40%