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INVESTMENTS - Restricted assets (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Investments [Line Items] |  |  |
Collateral in Trust for inter-company agreements |  | $ 1,580,689,000 | $ 2,121,522,000
Collateral for secured letter of credit facility |  | 473,187,000 | 470,051,000
Funds at Lloyd's |  | 1,314,345,000 | 1,307,945,000
Collateral in Trust for third party agreements |  | 1,856,327,000 | 1,510,416,000
Securities on deposit with regulatory authorities |  | 76,229,000 | 64,360,000
Total restricted investments |  | 5,300,777,000 | 5,474,294,000
Syndicate 2007 |  |  |
Restricted Investments [Line Items] |  |  |
Collateral in Trust for third party agreements |  | 365,000,000 | 403,000,000
Pledged cash for third party insurance and reinsurance agreements |  | 16,000,000 | 39,000,000
Syndicate 1686 |  |  |
Restricted Investments [Line Items] |  |  |
Collateral in Trust for third party agreements |  | 169,000,000 | 0
Pledged cash for third party insurance and reinsurance agreements |  | $ 181,000,000 | $ 154,000,000
Axis Corporate Capital UK Limited |  |  |
Restricted Investments [Line Items] |  |  |
Capital support, percentage | 70.00% | 70.00% |
Axis Corporate Capital UK Limited II |  |  |
Restricted Investments [Line Items] |  |  |
Capital support, percentage | 30.00% | 30.00% |

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- Definition Pledged Cash For Third Party Insurance And Reinsurance Agreements + 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 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 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 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 http://asc.fasb.org/extlink&oid=75763970&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 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + 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 letter of credit arrangements, 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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