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Business Segments
 9 Months Ended
Sep. 30, 2024
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 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.
  Revenues  
(In thousands)Earned
Premiums (1)		Investment
Income 		OtherTotal (2)Pre-Tax Income (Loss)Net Income (Loss) to Common Stockholders
Three months ended September 30, 2024
Insurance$2,564,490 $253,234 $9,189 $2,826,913 $469,421 $363,026 
Reinsurance & Monoline Excess362,333 57,037 — 419,370 105,225 82,659 
Corporate, other and eliminations (3)— 13,485 148,697 162,182 (92,111)(72,008)
Net investment losses— — (8,086)(8,086)(8,086)(8,043)
Total$2,926,823 $323,756 $149,800 $3,400,379 $474,449 $365,634 
Three months ended September 30, 2023
Insurance$2,291,917 $204,030 $9,143 $2,505,090 $410,909 $326,086 
Reinsurance & Monoline Excess349,997 59,021 — 409,018 110,442 86,747 
Corporate, other and eliminations (3)— 7,893 151,063 158,956 (58,976)(46,226)
Net investment losses— — (42,426)(42,426)(42,426)(33,021)
Total$2,641,914 $270,944 $117,780 $3,030,638 $419,949 $333,586 
Nine months ended September 30, 2024
Insurance$7,447,828 $801,573 $28,202 $8,277,603 $1,437,623 $1,102,363 
Reinsurance & Monoline Excess1,089,757 168,721 — 1,258,478 357,299 282,423 
Corporate, other and eliminations (3)— 45,429 430,492 475,921 (217,912)(169,764)
Net investment losses— — (40,818)(40,818)(40,818)(35,008)
Total$8,537,585 $1,015,723 $417,876 $9,971,184 $1,536,192 $1,180,014 
Nine months ended September 30, 2023
Insurance$6,650,027 $552,917 $27,570 $7,230,514 $1,149,886 $900,434 
Reinsurance & Monoline Excess1,036,046 155,790 — 1,191,836 317,146 251,420 
Corporate, other and eliminations (3)— 30,787 429,180 459,967 (253,066)(199,040)
Net investment gains— — 39,239 39,239 39,239 31,206 
Total$7,686,073 $739,494 $495,989 $8,921,556 $1,253,205 $984,020 
_________________
(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 September 30, 2024 and 2023 were $350 million and $298 million, respectively, and for the nine months ended September 30, 2024 and 2023 were $1,112 million and $852 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended September 30, 2024 and 2023 were $125 million and $124 million, respectively, and for the nine months ended September 30, 2024 and 2023 were $353 million and $333 million, respectively.
(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments.

Identifiable Assets
(In thousands)September 30,
2024		December 31,
2023
Insurance$32,687,852 $29,923,282 
Reinsurance & Monoline Excess5,842,643 5,545,249 
Corporate, other and eliminations1,828,803 1,643,299 
Consolidated$40,359,298 $37,111,830 


    Net premiums earned by major line of business are as follows:
 For the Three Months
Ended September 30,		For the Nine Months
Ended September 30,
(In thousands)2024202320242023
Insurance:
Other liability$1,031,087 $916,394 $3,000,335 $2,660,850 
Short-tail lines (1)563,736 472,805 1,613,342 1,330,173 
Auto376,762 327,507 1,092,354 929,201 
Workers' compensation313,154 300,694 925,214 905,405 
Professional liability279,751 274,517 816,583 824,398 
Total Insurance2,564,490 2,291,917 7,447,828 6,650,027 
Reinsurance & Monoline Excess:
Casualty (2)188,284 201,795 585,208 618,855 
Property (2)108,386 87,838 308,024 239,338 
Monoline excess (3)65,663 60,364 196,525 177,853 
Total Reinsurance & Monoline Excess362,333 349,997 1,089,757 1,036,046 
Total$2,926,823 $2,641,914 $8,537,585 $7,686,073 
______________
(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.