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INVESTMENTS - Summary of Restricted Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Restricted Investments [Line Items] |  |
Collateral in Trust for inter-company agreements | $ 790,449 | $ 886,903
Collateral for secured letter of credit facility | 424,624 | 402,478
Funds at Lloyd's | 748,573 | 936,862
Collateral in Trust for third-party agreements | 2,491,317 | 2,412,882
Securities on deposit or in trust with regulatory authorities | 731,660 | 729,072
Total restricted investments and cash | 5,186,623 | 5,368,197
Syndicate 1686 | Fixed maturities |  |
Restricted Investments [Line Items] |  |
Collateral in Trust for third-party agreements | 539,000 | 507,000
Syndicate 1686 | Cash |  |
Restricted Investments [Line Items] |  |
Collateral in Trust for third-party agreements | $ 217,000 | $ 326,000
Axis Corporate Capital UK Limited |  |
Restricted Investments [Line Items] |  |
Capital support, percentage | 70.00% |
Axis Corporate Capital UK Limited II |  |
Restricted Investments [Line Items] |  |
Capital support, percentage | 30.00% |

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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for inter-company insurance and reinsurance agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Pledged Financial Instruments, Not Separately Reported, Securities For Letter Of Credit Facility + References No definition available. + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for insurance and reinsurance agreements with third parties, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Pledged Financial Instruments, Underwriting Support + References No definition available. + Details
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- Definition Restricted Investments [Line Items] + References No definition available. + Details
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- Definition The amount of capital support provided to Lloyd's Syndicate 1686. + References No definition available. + Details
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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123600598&loc=SL75763979-209797 + Details
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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581 + Details
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