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SEGMENT REPORTING
 9 Months Ended
Sep. 30, 2026
Segment Reporting [Abstract]  
SEGMENT REPORTING
NOTE 12. SEGMENT REPORTING
The Company’s reportable segments are defined as follows: (1) Property, which is comprised of catastrophe and other property (re)insurance written on behalf of the Company’s consolidated operating subsidiaries, joint ventures and managed funds, and (2) Casualty and Specialty, which is comprised of casualty and specialty (re)insurance written on behalf of the Company’s consolidated operating subsidiaries, joint ventures and managed funds. The Company’s results also include other items which are not allocated to the Company’s reportable segments and primarily include its investments unit, strategic investments, corporate expenses, certain expenses related to acquisitions and dispositions, capital servicing costs, income tax benefit (expense) and noncontrolling interests.
The Company’s reportable segments each have executive leadership who are responsible for the overall performance of their respective segments and who are directly accountable to the Company’s chief operating decision maker (“CODM”), the Chief Executive Officer of RenaissanceRe, who is ultimately responsible for reviewing the business to assess performance, making operating decisions and allocating resources. The Company reports the results of its operations consistent with the manner in which the CODM reviews the business.
The Company does not manage its assets by segment; accordingly, net investment income and total assets are not allocated to the segments.
A summary of the significant components of the Company’s revenues and expenses by segment is as follows:
Three months ended September 30, 2026Three months ended September 30, 2025
Total Underwriting PortfolioReportable SegmentsTotal Underwriting PortfolioReportable Segments
PropertyCasualty and SpecialtyPropertyCasualty and Specialty
Gross premiums written$2,104,008 $628,750 $1,475,258 $2,323,626 $733,274 $1,590,352 
Net premiums written$1,665,477 $580,989 $1,084,488 $2,057,802 $694,125 $1,363,677 
Net premiums earned$2,101,076 $829,762 $1,271,314 $2,433,805 $936,933 $1,496,872 
Net claims and claim expenses incurred1,026,492 34,268 992,224 878,820 (133,504)1,012,324 
Acquisition expenses542,893 158,814 384,079 659,723 192,347 467,376 
Operational expenses105,600 76,057 29,543 125,073 86,579 38,494 
Underwriting income (loss)$426,091 $560,623 $(134,532)$770,189 $791,511 $(21,322)
Net claims and claim expenses incurred – current accident year$1,293,637 $299,300 $994,337 $1,258,871 $250,169 $1,008,702 
Net claims and claim expenses incurred – prior accident years(267,145)(265,032)(2,113)(380,051)(383,673)3,622 
Net claims and claim expenses incurred – total$1,026,492 $34,268 $992,224 $878,820 $(133,504)$1,012,324 
Net claims and claim expense ratio – current accident year61.6 %36.1 %78.2 %51.7 %26.7 %67.4 %
Net claims and claim expense ratio – prior accident years(12.7)%(32.0)%(0.2)%(15.6)%(40.9)%0.2 %
Net claims and claim expense ratio – calendar year48.9 %4.1 %78.0 %36.1 %(14.2)%67.6 %
Underwriting expense ratio30.8 %28.3 %32.6 %32.3 %29.7 %33.8 %
Combined ratio79.7 %32.4 %110.6 %68.4 %15.5 %101.4 %
Underwriting Income (Loss) and Consolidated ResultsTotalTotal
Underwriting income (loss)$426,091 $770,189 
Net investment income440,853 438,354 
Net foreign exchange gains (losses)831 877 
Equity in earnings (losses) of other ventures28,539 12,551 
Other income (loss)14 705 
Net realized and unrealized gains (losses) on investments(879,843)311,890 
Corporate expenses(16,685)(23,414)
Interest expense(31,794)(30,582)
Income (loss) before taxes(31,994)1,480,570 
Income tax benefit (expense)30,153 (148,860)
Net (income) loss attributable to redeemable noncontrolling interests(150,700)(415,200)
Dividends on preference shares(8,843)(8,843)
Net income (loss) available (attributable) to RenaissanceRe common shareholders$(161,384)$907,667 
Nine months ended September 30, 2026Nine months ended September 30, 2025
Total Underwriting PortfolioReportable SegmentsTotal Underwriting PortfolioReportable Segments
PropertyCasualty and SpecialtyPropertyCasualty and Specialty
Gross premiums written$8,577,305 $3,887,855 $4,689,450 $9,900,309 $4,596,042 $5,304,267 
Net premiums written$6,620,733 $3,039,606 $3,581,127 $8,271,601 $3,710,676 $4,560,925 
Net premiums earned$6,484,211 $2,612,111 $3,872,100 $7,566,740 $3,052,893 $4,513,847 
Net claims and claim expenses incurred2,952,841 111,297 2,841,544 4,664,701 1,481,823 3,182,878 
Acquisition expenses1,628,022 491,281 1,136,741 1,949,763 534,192 1,415,571 
Operational expenses289,382 212,372 77,010 350,996 222,414 128,582 
Underwriting income (loss)$1,613,966 $1,797,161 $(183,195)$601,280 $814,464 $(213,184)
Net claims and claim expenses incurred – current accident year$3,581,426 $794,542 $2,786,884 $5,510,336 $2,319,130 $3,191,206 
Net claims and claim expenses incurred – prior accident years(628,585)(683,245)54,660 (845,635)(837,307)(8,328)
Net claims and claim expenses incurred – total$2,952,841 $111,297 $2,841,544 $4,664,701 $1,481,823 $3,182,878 
Net claims and claim expense ratio – current accident year55.2 %30.4 %72.0 %72.8 %76.0 %70.7 %
Net claims and claim expense ratio – prior accident years(9.7)%(26.1)%1.4 %(11.2)%(27.5)%(0.2)%
Net claims and claim expense ratio – calendar year45.5 %4.3 %73.4 %61.6 %48.5 %70.5 %
Underwriting expense ratio29.6 %26.9 %31.3 %30.5 %24.8 %34.2 %
Combined ratio75.1 %31.2 %104.7 %92.1 %73.3 %104.7 %
Underwriting Income (Loss) and Consolidated ResultsTotalTotal
Underwriting income (loss)$1,613,966 $601,280 
Net investment income1,293,844 1,256,815 
Net foreign exchange gains (losses)(15,533)2,209 
Equity in earnings (losses) of other ventures66,853 50,712 
Other income (loss)5,740 4,243 
Net realized and unrealized gains (losses) on investments(1,180,128)994,550 
Corporate expenses(54,826)(70,005)
Interest expense(95,358)(89,461)
Income (loss) before taxes1,634,558 2,750,343 
Income tax benefit (expense)(142,231)(280,204)
Net (income) loss attributable to redeemable noncontrolling interests(688,411)(548,287)
Dividends on preference shares(26,531)(26,531)
Net income (loss) available (attributable) to RenaissanceRe common shareholders$777,385 $1,895,321