Segment Reporting - Schedule of Significant Components of the Company's Revenues and Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Gross premiums written (Note 7)	$ 8,862,366	$ 9,213,540	$ 7,833,798
Net premiums written	7,467,813	7,196,160	5,939,375
Net premiums earned	7,471,133	6,333,989	5,194,181
Net claims and claim expenses incurred	3,573,509	4,338,840	3,876,087
Acquisition expenses	1,875,034	1,568,606	1,214,858
Operational expenses	375,182	276,691	212,184
Underwriting income (loss)	1,647,408	149,852	(108,948)
Net investment income	1,253,110	559,932	319,479
Net foreign exchange gains (losses)	(41,479)	(56,909)	(41,006)
Equity in earnings of other ventures	43,474	11,249	12,309
Other income (loss)	(6,152)	12,636	10,880
Net realized and unrealized gains (losses) on investments	414,522	(1,800,485)	(218,134)
Corporate expenses	(127,642)	(46,775)	(41,152)
Interest expense	(73,181)	(48,335)	(47,536)
Income (loss) before taxes	3,110,060	(1,218,835)	(114,108)
Income tax benefit (expense)	510,067	59,019	10,668
Net (income) loss attributable to redeemable noncontrolling interests	(1,058,995)	98,613	63,285
Dividends on preference shares	(35,375)	(35,375)	(33,266)
Net income (loss) available (attributable) to RenaissanceRe common shareholders	2,525,757	(1,096,578)	(73,421)
Net claims and claim expenses incurred – current accident year	4,024,116	4,586,422	4,125,557
Net claims and claim expenses incurred – prior accident years	(450,607)	(247,582)	(249,470)
Total net incurred	$ 3,573,509	$ 4,338,840	$ 3,876,087
Net claims and claim expense ratio – current accident year	53.90%	72.40%	79.40%
Net claims and claim expense ratio – prior accident years	(6.10%)	(3.90%)	(4.80%)
Net claims and claim expense ratio – calendar year	47.80%	68.50%	74.60%
Underwriting expense ratio	30.10%	29.20%	27.50%
Combined ratio	77.90%	97.70%	102.10%
Other
Segment Reporting Information [Line Items]
Gross premiums written (Note 7)	$ 0	$ 0	$ 0
Net premiums written	0	0	0
Net premiums earned	0	0	0
Net claims and claim expenses incurred	0	0	0
Acquisition expenses	0	0	0
Operational expenses	0	0	0
Underwriting income (loss)	0	0	0
Net investment income	1,253,110	559,932	319,479
Net foreign exchange gains (losses)	(41,479)	(56,909)	(41,006)
Equity in earnings of other ventures	43,474	11,249	12,309
Other income (loss)	(6,152)	12,636	10,880
Net realized and unrealized gains (losses) on investments	414,522	(1,800,485)	(218,134)
Corporate expenses	(127,642)	(46,775)	(41,152)
Interest expense	(73,181)	(48,335)	(47,536)
Income tax benefit (expense)	510,067	59,019	10,668
Net (income) loss attributable to redeemable noncontrolling interests	(1,058,995)	98,613	63,285
Dividends on preference shares	(35,375)	(35,375)	(33,266)
Net claims and claim expenses incurred – current accident year	0	0	0
Net claims and claim expenses incurred – prior accident years	0	0	0
Total net incurred	0	0	0
Property
Segment Reporting Information [Line Items]
Gross premiums written (Note 7)	3,562,414	3,734,241	3,958,724
Net claims and claim expenses incurred – prior accident years	(408,905)	(205,741)	(233,373)
Property | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written (Note 7)	3,562,414	3,734,241	3,958,724
Net premiums written	2,967,309	2,847,659	2,868,002
Net premiums earned	3,090,792	2,770,227	2,608,298
Net claims and claim expenses incurred	799,905	2,044,771	2,163,016
Acquisition expenses	600,127	547,210	487,178
Operational expenses	251,433	194,355	143,608
Underwriting income (loss)	1,439,327	(16,109)	(185,504)
Net claims and claim expenses incurred – current accident year	1,208,810	2,250,512	2,396,389
Net claims and claim expenses incurred – prior accident years	(408,905)	(205,741)	(233,373)
Total net incurred	$ 799,905	$ 2,044,771	$ 2,163,016
Net claims and claim expense ratio – current accident year	39.10%	81.20%	91.90%
Net claims and claim expense ratio – prior accident years	(13.20%)	(7.40%)	(9.00%)
Net claims and claim expense ratio – calendar year	25.90%	73.80%	82.90%
Underwriting expense ratio	27.50%	26.80%	24.20%
Combined ratio	53.40%	100.60%	107.10%
Casualty and Specialty
Segment Reporting Information [Line Items]
Gross premiums written (Note 7)	$ 5,299,952	$ 5,479,299	$ 3,875,074
Net claims and claim expenses incurred – prior accident years	(41,702)	(41,841)	(16,097)
Casualty and Specialty | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written (Note 7)	5,299,952	5,479,299	3,875,074
Net premiums written	4,500,504	4,348,501	3,071,373
Net premiums earned	4,380,341	3,563,762	2,585,883
Net claims and claim expenses incurred	2,773,604	2,294,069	1,713,071
Acquisition expenses	1,274,907	1,021,396	727,680
Operational expenses	123,749	82,336	68,576
Underwriting income (loss)	208,081	165,961	76,556
Net claims and claim expenses incurred – current accident year	2,815,306	2,335,910	1,729,168
Net claims and claim expenses incurred – prior accident years	(41,702)	(41,841)	(16,097)
Total net incurred	$ 2,773,604	$ 2,294,069	$ 1,713,071
Net claims and claim expense ratio – current accident year	64.30%	65.50%	66.90%
Net claims and claim expense ratio – prior accident years	(1.00%)	(1.10%)	(0.70%)
Net claims and claim expense ratio – calendar year	63.30%	64.40%	66.20%
Underwriting expense ratio	31.90%	30.90%	30.80%
Combined ratio	95.20%	95.30%	97.00%