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SEGMENT INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2022
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, 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 ratio 14.2 %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(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 ratio16.2 %5.1 %14.0 %
Combined ratio91.6 %99.0 %97.5 %
Goodwill and intangible assets$309,518 $— $309,518 
At and year ended December 31, 2020InsuranceReinsuranceTotal
Gross premiums written$4,018,399 $2,808,539 $6,826,938 
Net premiums written2,357,501 1,978,908 4,336,409 
Net premiums earned2,299,038 2,072,271 4,371,309 
Other insurance related income (loss)2,647 (10,736)(8,089)
Net losses and loss expenses(1,697,014)(1,584,238)(3,281,252)
Acquisition costs(461,533)(467,984)(929,517)
Underwriting-related general and administrative expenses(378,839)(99,129)(477,968)
Underwriting income (loss)$(235,701)$(89,816)(325,517)
Net investment income349,601 
Net investment gains129,133 
Corporate expenses(101,822)
Foreign exchange losses(81,069)
Interest expense and financing costs(75,049)
Reorganization expenses(7,881)
Amortization of value of business acquired(5,139)
Amortization of intangible assets(11,390)
Income (loss) before income taxes and interest in income (loss) of equity method investments(129,133)
Income tax benefit12,321 
Interest in income (loss) of equity method investments(3,612)
Net income (loss)(120,424)
Preferred share dividends30,250 
Net income (loss) available (attributable) to common shareholders$(150,674)
Net losses and loss expenses ratio73.8 %76.4 %75.1 %
Acquisition cost ratio20.1 %22.6 %21.3 %
General and administrative expense ratio 16.5 %4.8 %13.2 %
Combined ratio110.4 %103.8 %109.6 %
Goodwill and intangible assets$320,434 $— $320,434 
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 31,202220212020
U.S.$4,342,707 $4,002,748 $3,398,108 
Ireland1,931,815 1,667,496 1,516,596 
Lloyd's of London1,567,458 1,473,047 1,309,802 
Bermuda372,615 542,693 602,432 
Gross premiums written$8,214,595 $7,685,984 $6,826,938 
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 31,202220212020
Insurance
Professional lines$817,924 $646,390 $509,448 
Property755,986 711,297 653,186 
Liability459,775 354,787 315,434 
Cyber309,004 252,077 206,720 
Marine and aviation479,499 439,050 364,656 
Accident and health209,548 151,133 143,725 
Credit and political risk102,419 96,605 105,869 
Total Insurance3,134,155 2,651,339 2,299,038 
Reinsurance
Liability484,681 431,596 397,894 
Accident and health368,747 361,196 333,997 
Professional lines250,911 220,448 207,605 
Credit and surety192,926 158,549 187,722 
Motor205,774 247,099 256,064 
Agriculture122,289 82,743 73,697 
Marine and aviation78,504 58,775 53,513 
Run-off lines
Catastrophe156,232 238,775 244,934 
Property135,480 231,092 256,324 
Engineering30,627 28,238 60,521 
Total run-off lines322,339 498,105 561,779 
Total Reinsurance2,026,171 2,058,511 2,072,271 
Total$5,160,326 $4,709,850 $4,371,309