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RELATED PARTY TRANSACTIONS (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 03, 2025 | Sep. 22, 2023 | Jun. 29, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  | $ 930,278,000 | $ 949,413,000 |  |
Equity method investments |  |  |  | 206,994,000 | 174,634,000 |  |
Net premiums earned |  |  |  | 5,306,235,000 | 5,083,781,000 | $ 5,160,326,000 |
Acquisition costs |  |  |  | 1,070,551,000 | 1,000,945,000 | 1,022,017,000 |
Net losses and loss expenses |  |  |  | 3,158,487,000 | 3,393,102,000 | 3,242,410,000 |
Reinsurance recoverable on unpaid claims |  |  |  | 6,840,897,000 | 6,323,083,000 | 5,831,172,000 | $ 5,017,611,000
Reinsurance recoverable on paid losses and loss expenses |  |  |  | 546,287,000 | 575,847,000 |  |
Ceded premiums |  |  |  | 3,248,537,000 | 3,254,200,000 | 2,951,539,000 |
Ceded losses and loss expenses |  |  |  | 2,039,000,000 | 1,754,000,000 | 1,754,000,000 |
Reinsurance recoverable on unpaid and paid losses and loss expenses |  |  |  | 7,400,000,000 | 6,900,000,000 |  |
Insurance and reinsurance balances payable |  |  |  | 1,713,798,000 | 1,792,719,000 |  |
Loan advance |  |  |  | 199,045,000 | 349,842,000 | 105,822,000 |
Loan balance receivable |  |  |  | 247,775,000 | 305,222,000 |  |
T-VIII PubOpps LP ("T8") | Subsequent event |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total shares (in shares) | 2,234,636 |  |  |  |  |  |
Total cost | $ 200,000,000 |  |  |  |  |  |
Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  | 448,000,000 | 424,000,000 |  |
Related Party | SKY Harbor Capital Management, LLC |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 3,000,000 | 3,000,000 | 2,000,000 |
Related Party | Freedom |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 0 | 1,000,000 | 2,000,000 |
Other investments |  |  |  | 3,000,000 | 17,000,000 |  |
Related Party | Stone Point Trident Fund VIII |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 4,000,000 | 2,000,000 | 2,000,000 |
Other investments |  |  |  | 92,000,000 | 87,000,000 |  |
Related Party | Stone Point Trident VIII Co-Invest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  | 30,000,000 | 26,000,000 |  |
Related Party | Trident IX L.P. ("Trident IX") |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 3,000,000 | 1,000,000 | 1,000,000 |
Other investments |  |  |  | 39,000,000 | 24,000,000 |  |
Related Party | Rialto Real Estate IV-Property |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  | 48,000,000 | 43,000,000 |  |
Related Party | Rialto Real Estate Fund IV-Property |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 2,000,000 | 2,000,000 | 2,000,000 |
Other investments |  |  |  | 23,000,000 | 19,000,000 |  |
Related Party | Stone Point Credit Corporation |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 500,000 | 500,000 | 300,000 |
Other investments |  |  |  | 18,000,000 | 18,000,000 |  |
Related Party | Sound Point Capital Bond |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  |  | 5,000,000 |  |
Related Party | Gordon Brothers |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  |  | 100,000 | 100,000 |
Other investments |  |  |  |  | 9,000,000 |  |
Related Party | Eagle Point Credit Management, LLC |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  | 7,000,000 | 7,000,000 |  |
Related Party | Aspida Holdings, Ltd |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 0 | 0 |  |
Other investments |  |  |  | 6,000,000 | 6,000,000 |  |
Related Party | Monarch Point Re |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 1,000,000 | 100,000 |  |
Equity method investments |  |  |  | 43,000,000 | 22,000,000 |  |
Net premiums earned |  | $ 119,000,000 |  |  |  |  |
Acquisition costs |  | 33,000,000 |  |  |  |  |
Net losses and loss expenses |  | $ 7,000,000 |  |  |  |  |
Reinsurance recoverable on unpaid claims |  |  |  |  | 76,000,000 |  |
Reinsurance recoverable on paid losses and loss expenses |  |  |  |  | 4,000,000 |  |
Ceded premiums |  |  |  | 323,000,000 | 287,000,000 |  |
Ceded losses and loss expenses |  |  |  | 214,000,000 | 37,000,000 |  |
Reinsurance recoverable on unpaid and paid losses and loss expenses |  |  |  | 246,000,000 | 37,000,000 |  |
Insurance and reinsurance balances payable |  |  |  | 226,000,000 | 166,000,000 |  |
Related Party | Harrington Re |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Ceded premiums |  |  |  | 218,000,000 | 298,000,000 | 324,000,000 |
Ceded losses and loss expenses |  |  |  | 197,000,000 | 229,000,000 | 234,000,000 |
Reinsurance recoverable on unpaid and paid losses and loss expenses |  |  |  | 884,000,000 | 933,000,000 |  |
Insurance and reinsurance balances payable |  |  |  | 181,000,000 | 219,000,000 |  |
Related Party | Stone Point Credit, LLC. |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other commitment |  |  |  | 60,000,000 |  |  |
Related Party | Stone Point Trident X LP |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other commitment |  |  |  | 25,000,000 |  |  |
Stone Pointe Credit Corporation Bonds | Related Party | Stone Point Credit Corporation |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  |  | 18,000,000 | 18,000,000 |  |
Stone Point Credit Corporation Bonds, Earned Income | Related Party | Stone Point Credit Corporation |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 1,000,000 | 1,000,000 | $ 600,000 |
Eagle Point Credit Management Loan, Earned Income | Related Party | Eagle Point Credit Management, LLC |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Income earned |  |  |  | 700,000 | 500,000 |  |
Loan Agreement With Monarch Point Re | Related Party | Monarch Point Re |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other commitment |  |  |  | 0 | 16,000,000 |  |
Loan advance |  |  |  | 253,000,000 | 297,000,000 |  |
Non-cash repayment of advance |  |  |  | 236,000,000 | 72,000,000 |  |
Loan balance receivable |  |  |  | 243,000,000 | 225,000,000 |  |
Interest received in advance |  |  |  | $ 7,000,000 | $ 9,000,000 |  |
Loan Agreement With Monarch Point Re | Related Party | Monarch Point Re | Minimum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party transaction floating rate (as a percent) |  |  |  | 4.70% | 5.70% |  |
Loan Agreement With Monarch Point Re | Related Party | Monarch Point Re | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party transaction floating rate (as a percent) |  |  |  | 5.50% | 5.90% |  |
Investment In Related Party | Senior Unsecured Notes Due 2031 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments |  |  | $ 10,000,000 |  |  |  |
Related party transaction floating rate (as a percent) |  |  | 7.25% |  |  |  |
Stone Point Group | Related Party | Pantheon |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Percentage ownership by related parties |  |  |  | 14.50% |  |  |
Stone Point Trident V Funds | Enstar Group Limited |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Indirectly held ownership interest |  |  |  | 9.50% |  |  |

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