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Schedule III - Supplementary Insurance Information | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |
Schedule III - Supplementary Insurance Information | Schedule III W. R. Berkley Corporation and Subsidiaries Supplementary Insurance Information December 31, 2024, 2023 and 2022
(In thousands) | Deferred Policy Acquisition Cost |  | Reserve for Losses and Loss Expenses |  | Unearned Premiums |  | Net Premiums Earned |  | Net Investment Income |  | Loss and Loss Expenses |  | Amortization of Deferred Policy Acquisition Cost |  | Other Operating Costs and Expenses |  | Net Premiums Written
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 840,917 |  |  | $ | 16,887,821 |  |  | $ | 5,836,435 |  |  | $ | 10,086,308 |  |  | $ | 1,057,738 |  |  | $ | 6,332,490 |  |  | $ | 1,081,170 |  |  | $ | 1,825,758 |  |  | $ | 10,549,550 |
Reinsurance & Monoline Excess | 110,811 |  |  | 3,480,209 |  |  | 538,677 |  |  | 1,462,177 |  |  | 234,728 |  |  | 799,105 |  |  | 138,679 |  |  | 292,526 |  |  | 1,422,546 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 40,695 |  |  | — |  |  | — |  |  | 264,173 |  |  | — |
Total | $ | 951,728 |  |  | $ | 20,368,030 |  |  | $ | 6,375,112 |  |  | $ | 11,548,485 |  |  | $ | 1,333,161 |  |  | $ | 7,131,595 |  |  | $ | 1,219,849 |  |  | $ | 2,382,457 |  |  | $ | 11,972,096 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 736,348 |  |  | $ | 15,298,372 |  |  | $ | 5,322,869 |  |  | $ | 9,007,376 |  |  | $ | 783,660 |  |  | $ | 5,615,526 |  |  | $ | 897,908 |  |  | $ | 1,684,514 |  |  | $ | 9,560,533 |
Reinsurance & Monoline Excess | 125,261 |  |  | 3,441,280 |  |  | 599,457 |  |  | 1,393,311 |  |  | 221,966 |  |  | 756,616 |  |  | 141,067 |  |  | 268,309 |  |  | 1,393,934 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 47,209 |  |  | — |  |  | — |  |  | 372,138 |  |  | — |
Total | $ | 861,609 |  |  | $ | 18,739,652 |  |  | $ | 5,922,326 |  |  | $ | 10,400,687 |  |  | $ | 1,052,835 |  |  | $ | 6,372,142 |  |  | $ | 1,038,975 |  |  | $ | 2,324,961 |  |  | $ | 10,954,467 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 633,493 |  |  | $ | 13,655,613 |  |  | $ | 4,708,586 |  |  | $ | 8,171,828 |  |  | $ | 543,844 |  |  | $ | 5,013,614 |  |  | $ | 881,567 |  |  | $ | 1,418,374 |  |  | $ | 8,609,028 |
Reinsurance & Monoline Excess | 129,993 |  |  | 3,355,610 |  |  | 589,068 |  |  | 1,389,601 |  |  | 200,512 |  |  | 848,136 |  |  | 157,336 |  |  | 247,918 |  |  | 1,395,042 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 34,829 |  |  | — |  |  | — |  |  | 256,310 |  |  | — |
Total | $ | 763,486 |  |  | $ | 17,011,223 |  |  | $ | 5,297,654 |  |  | $ | 9,561,429 |  |  | $ | 779,185 |  |  | $ | 5,861,750 |  |  | $ | 1,038,903 |  |  | $ | 1,922,602 |  |  | $ | 10,004,070 |
__________________________ See Report of Independent Registered Public Accounting Firm.

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- Definition The entire disclosure for supplementary insurance information by segment. Includes, but is not limited to, deferred policy acquisition cost; future policy benefit, loss, claim and loss expenses; unearned premium; other policy claim and benefit payable; premium revenue; net investment income; benefit, claim, loss and settlement expenses; amortization of deferred policy acquisition cost; other operating expense; and premium written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Paragraph Column J -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Paragraph Column G -Footnote 3 -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column J)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1 + Details
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