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SEGMENT INFORMATION (Tables)
12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Summary of Underwriting Results of Reportable Segments
The following tables present the underwriting results of the Company's reportable segments, as well as the carrying amounts of allocated goodwill and intangible assets:
At and year ended December 31, 2023InsuranceReinsuranceTotal
Gross premiums written$6,140,764 $2,215,761 $8,356,525 
Net premiums written3,758,720 1,343,605 5,102,325 
Net premiums earned3,461,700 1,622,081 5,083,781 
Other insurance related income (loss)(198)22,693 22,495 
Net losses and loss expenses(2,080,001)(1,313,101)(3,393,102)
Acquisition costs(648,463)(352,482)(1,000,945)
Underwriting-related general and administrative expenses(472,094)(79,373)(551,467)
Underwriting income (loss)$260,944 $(100,182)160,762 
Net investment income611,742 
Net investment gains (losses)(74,630)
Corporate expenses(132,979)
Foreign exchange (losses) gains(58,115)
Interest expense and financing costs(68,421)
Reorganization expenses(28,997)
Amortization of value of business acquired 
Amortization of intangible assets(10,917)
Income before income taxes and interest in income of equity method investments398,445 
Income tax expense(26,316)
Interest in income of equity method investments4,163 
Net income376,292 
Preferred share dividends30,250 
Net income available to common shareholders$346,042 
Net losses and loss expenses ratio60.1 %81.0 %66.7 %
Acquisition cost ratio18.7 %21.7 %19.7 %
General and administrative expense ratio 13.7 %4.9 %13.5 %
Combined ratio92.5 %107.6 %99.9 %
Goodwill and intangible assets$287,684 $ $287,684 
At and year ended December 31, 2022InsuranceReinsuranceTotal
Gross premiums written$5,585,581 $2,629,014 $8,214,595 
Net premiums written3,377,906 1,885,150 5,263,056 
Net premiums earned3,134,155 2,026,171 5,160,326 
Other insurance related income559 12,514 13,073 
Net losses and loss expenses(1,785,854)(1,456,556)(3,242,410)
Acquisition costs(577,838)(444,179)(1,022,017)
Underwriting-related general and administrative expenses(443,704)(106,585)(550,289)
Underwriting income$327,318 $31,365 358,683 
Net investment income418,829 
Net investment gains (losses)(456,789)
Corporate expenses(130,054)
Foreign exchange gains157,945 
Interest expense and financing costs(63,146)
Reorganization expenses(31,426)
Amortization of value of business acquired— 
Amortization of intangible assets(10,917)
Income before income taxes and interest in income of equity method investments243,125 
Income tax expense(22,037)
Interest in income of equity method investments1,995 
Net income223,083 
Preferred share dividends30,250 
Net income available to common shareholders$192,833 
Net losses and loss expenses ratio57.0 %71.9 %62.8 %
Acquisition cost ratio18.4 %21.9 %19.8 %
General and administrative expense ratio14.2 %5.3 %13.2 %
Combined ratio89.6 %99.1 %95.8 %
Goodwill and intangible assets$298,601 $— $298,601 
At and year ended December 31, 2021InsuranceReinsuranceTotal
Gross premiums written$4,863,232 $2,822,752 $7,685,984 
Net premiums written2,894,885 2,031,739 4,926,624 
Net premiums earned2,651,339 2,058,511 4,709,850 
Other insurance related income1,662 21,633 23,295 
Net losses and loss expenses(1,514,998)(1,493,785)(3,008,783)
Acquisition costs(484,344)(437,490)(921,834)
Underwriting-related general and administrative expenses(429,282)(107,552)(536,834)
Underwriting income$224,377 $41,317 265,694 
Net investment income454,301 
Net investment gains134,279 
Corporate expenses(126,470)
Foreign exchange (losses) gains(315)
Interest expense and financing costs(62,302)
Reorganization expenses— 
Amortization of value of business acquired(3,854)
Amortization of intangible assets(12,424)
Income before income taxes and interest in income of equity method investments648,909 
Income tax expense(62,384)
Interest in income of equity method investments32,084 
Net income618,609 
Preferred share dividends30,250 
Net income available to common shareholders$588,359 
Net losses and loss expenses ratio57.1 %72.6 %63.9 %
Acquisition cost ratio18.3 %21.3 %19.6 %
General and administrative expense ratio 16.2 %5.1 %14.0 %
Combined ratio91.6 %99.0 %97.5 %
Goodwill and intangible assets$309,518 $— $309,518 
Summary of Gross Premiums Written by Geographical Location of Subsidiaries
The following table presents gross premiums written by the geographical location of the Company's subsidiaries:
Years ended December 31,202320222021
U.S.$4,484,789 $4,342,707 $4,002,748 
Ireland1,837,177 1,931,815 1,667,496 
Lloyd's of London1,759,990 1,567,458 1,473,047 
Bermuda274,569 372,615 542,693 
Gross premiums written$8,356,525 $8,214,595 $7,685,984 
Summary of Net Premiums Earned by Segment and Line of Business
The following table presents net premiums earned by segment and line of business:    
Years ended December 31,202320222021
Insurance
Professional lines$764,558 $817,924 $646,390 
Property878,849 755,986 711,297 
Liability496,381 459,775 354,787 
Cyber323,025 309,004 252,077 
Marine and aviation567,292 479,499 439,050 
Accident and health306,061 209,548 151,133 
Credit and political risk125,534 102,419 96,605 
Total Insurance3,461,700 3,134,155 2,651,339 
Reinsurance
Liability403,239 484,681 431,596 
Accident and health341,806 368,747 361,196 
Professional lines205,404 250,911 220,448 
Credit and surety236,408 192,926 158,549 
Motor155,942 205,774 247,099 
Agriculture121,628 122,289 82,743 
Marine and aviation65,658 78,504 58,775 
Run-off lines
Catastrophe33,963 156,232 238,775 
Property44,508 135,480 231,092 
Engineering13,525 30,627 28,238 
Total run-off lines91,996 322,339 498,105 
Total Reinsurance1,622,081 2,026,171 2,058,511 
Total$5,083,781 $5,160,326 $4,709,850