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Commitments and Contingencies - Schedule of Company's Restricted Assets (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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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%

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- Definition Amount of investments classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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