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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, 2024 | Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |  |  |
Affiliated transactions |  | $ 433.4 | $ 660.8
Third party |  | 2,713.5 | 2,714.4
Letters of credit / guarantees (1) |  | 153.2 | 172.0
Total restricted assets (excluding illiquid assets) |  | 3,300.1 | 3,547.2
Other Investments | [1] | 267.2 | 209.3
Total restricted assets and illiquid assets |  | $ 3,567.3 | $ 3,756.5
Total as percent of invested assets |  | 46.40% | 50.20%
[1] | Other investments includes related party investments in Funds Managed by Apollo of $78.6 million (2023 — $39.8 million).

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- Definition Debt Securities, Available for Sale and Held for Trading, and Illiquid Assets, Restricted + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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