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Business Segments
 3 Months Ended
Mar. 31, 2025
Segment Reporting [Abstract]  
Business Segments Business Segments
    The Company’s reportable segments include the following two business segments, plus a corporate segment:
•Insurance - predominantly commercial insurance business, including excess and surplus lines, admitted lines and specialty personal lines throughout the United States, as well as insurance business in Asia, Australia, Canada, Continental Europe, Mexico, Scandinavia, South America and the United Kingdom.
•Reinsurance & Monoline Excess - reinsurance business on a facultative and treaty basis, primarily in the United States, the United Kingdom, Continental Europe, Australia, the Asia-Pacific Region and South Africa, as well as operations that solely retain risk on an excess basis and certain program management business.
The Company's chief operating decision maker ("CODM") is the President and Chief Executive Officer. The CODM assesses performance, makes decisions and allocates resources for each of the three reportable segments based on their contribution towards the Company's profitability and balance sheet strength. Certain key metrics such as combined ratio and return on allocated capital for the Insurance and Reinsurance & Monoline Excess segments, as well as Corporate segment expenditures, are examples of key components of the assessment, decision-making and resource-allocation process.
    The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Income tax expense and benefits are calculated based upon the Company's overall effective tax rate.
    Summary financial information about the Company's reporting segments is presented in the following tables. Income (loss) before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.
  RevenuesExpenses  
(In thousands)Earned
Premiums (1)		Investment
Income 		OtherTotal (2)Losses and Loss ExpensesPolicy Acquisition and Insurance Operating ExpensesOtherTotalPre-Tax Income (Loss)Net Income (Loss) to Common Stockholders
Three months ended March 31, 2025
Insurance$2,642,507 $291,248 $9,952 $2,943,707 $1,687,453 $735,661 $11,088 $2,434,202 $509,505 $393,122 
Reinsurance & Monoline Excess369,874 66,430 — 436,304 213,339 102,585 — 315,924 120,380 95,843 
Corporate, other and eliminations (3)— 2,614 148,419 151,033 — — 258,667 258,667 (107,634)(84,221)
Net investment gains— — 16,355 16,355 — — — — 16,355 12,827 
Total$3,012,381 $360,292 $174,726 $3,547,399 $1,900,792 $838,246 $269,755 $3,008,793 $538,606 $417,571 
Three months ended March 31, 2024
Insurance$2,398,768 $244,778 $9,423 $2,652,969 $1,481,552 $682,592 $10,676 $2,174,820 $478,149 $365,091 
Reinsurance & Monoline Excess365,579 53,211 — 418,790 182,226 108,940 — 291,166 127,624 102,126 
Corporate, other and eliminations (3)— 21,850 137,384 159,234 — — 216,716 216,716 (57,482)(43,893)
Net investment gains— — 25,780 25,780 — — — — 25,780 19,147 
Total$2,764,347 $319,839 $172,587 $3,256,773 $1,663,778 $791,532 $227,392 $2,682,702 $574,071 $442,471 
Identifiable Assets
(In thousands)March 31,
2025		December 31,
2024
Insurance$33,246,341 $32,911,507 
Reinsurance & Monoline Excess5,667,553 5,669,729 
Corporate, other and eliminations (3)2,431,898 1,867,399 
Consolidated$41,345,792 $40,448,635 
_________________
(1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions.
(2) Revenues for Insurance from foreign operations for the three months ended March 31, 2025 and 2024 were $333 million and $393 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended March 31, 2025 and 2024 were $130 million and $111 million, respectively.
(3) Corporate, other and eliminations represent corporate revenues and expenses and certain other items that are not allocated to business segments.

    Net premiums earned by major line of business are as follows:
 For the Three Months
Ended March 31,
(In thousands)20252024
Insurance:
Other liability$1,072,728 $967,260 
Short-tail lines (1)596,109 510,809 
Auto389,949 354,013 
Workers' compensation311,028 301,495 
Professional liability272,693 265,191 
Total Insurance2,642,507 2,398,768 
Reinsurance & Monoline Excess:
Casualty (2)181,767 197,844 
Property (2)120,843 102,384 
Monoline excess (3)67,264 65,351 
Total Reinsurance & Monoline Excess369,874 365,579 
Total$3,012,381 $2,764,347 
______________
(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery, high net worth homeowners and other lines.
(2) Includes reinsurance casualty and property and certain program management business.
(3) Monoline excess includes operations that solely retain risk on an excess basis.