Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Assets
Total investments	$ 17,818,597	$ 17,368,789
Cash and cash equivalents	896,216	1,379,068
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	3,105,441	2,599,896
Prepaid reinsurance premiums	1,151,926	767,781
Reinsurance recoverable	2,765,583	2,791,297	$ 2,908,343
Accrued investment income	73,496	72,461
Deferred acquisition costs	739,875	663,991
Receivable for investments sold	341,786	78,369
Other assets	312,523	346,216
Goodwill and other intangible assets	260,076	262,226
Total assets	27,465,519	26,330,094
Liabilities
Reserve for claims and claim expenses	9,406,707	9,384,349	8,391,484
Unearned premiums	3,245,914	2,530,975
Debt	1,134,695	1,384,105
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	3,775,375	2,830,691
Payable for investments purchased	636,136	225,275
Other liabilities	351,320	932,024
Total liabilities	18,550,147	17,287,419
Redeemable noncontrolling interests	3,231,846	3,071,308
Shareholders’ Equity
Total shareholders’ equity	5,683,526	5,971,367	$ 5,554,033
Total liabilities, noncontrolling interests and shareholders’ equity	27,465,519	26,330,094
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Assets
Total investments	24,564	288,137
Cash and cash equivalents	16,089	8,731
Investments in subsidiaries	1,392,419	1,426,838
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	43	1,171
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	9,937	12,211
Goodwill and other intangible assets	0	0
Total assets	1,443,052	1,737,088
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	721,867	970,255
Amounts due to subsidiaries and affiliates	117,770	102,493
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	11,366	14,162
Total liabilities	851,003	1,086,910
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	592,049	650,178
Total liabilities, noncontrolling interests and shareholders’ equity	1,443,052	1,737,088
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Assets
Total investments	275,173	190,451
Cash and cash equivalents	3,066	26,460
Investments in subsidiaries	5,017,427	5,204,260
Due from subsidiaries and affiliates	11,712	10,725
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	0
Deferred acquisition costs	0	0
Receivable for investments sold	2,186	173
Other assets	784,513	847,406
Goodwill and other intangible assets	115,186	116,212
Total assets	6,209,263	6,395,687
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	483,203	391,475
Amounts due to subsidiaries and affiliates	21,756	6,708
Reinsurance balances payable	0	0
Payable for investments purchased	1,100	0
Other liabilities	19,678	26,137
Total liabilities	525,737	424,320
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	5,683,526	5,971,367
Total liabilities, noncontrolling interests and shareholders’ equity	6,209,263	6,395,687
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Assets
Total investments	17,518,860	16,890,201
Cash and cash equivalents	877,061	1,343,877
Investments in subsidiaries	641,103	48,247
Due from subsidiaries and affiliates	(11,712)	101,579
Premiums receivable	3,105,441	2,599,896
Prepaid reinsurance premiums	1,151,926	767,781
Reinsurance recoverable	2,765,583	2,791,297
Accrued investment income	73,453	71,290
Deferred acquisition costs	739,875	663,991
Receivable for investments sold	339,600	78,196
Other assets	300,107	312,556
Goodwill and other intangible assets	144,890	146,014
Total assets	27,646,187	25,814,925
Liabilities
Reserve for claims and claim expenses	9,406,707	9,384,349
Unearned premiums	3,245,914	2,530,975
Debt	711,040	148,349
Amounts due to subsidiaries and affiliates	(139,526)	51
Reinsurance balances payable	3,775,375	2,830,691
Payable for investments purchased	635,036	225,275
Other liabilities	1,534,530	899,960
Total liabilities	19,169,076	16,019,650
Redeemable noncontrolling interests	3,231,846	3,071,308
Shareholders’ Equity
Total shareholders’ equity	5,245,265	6,723,967
Total liabilities, noncontrolling interests and shareholders’ equity	27,646,187	25,814,925
Consolidating Adjustments
Assets
Total investments	0	0
Cash and cash equivalents	0	0
Investments in subsidiaries	(7,050,949)	(6,679,345)
Due from subsidiaries and affiliates	0	(112,304)
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	0
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	(782,034)	(825,957)
Goodwill and other intangible assets	0	0
Total assets	(7,832,983)	(7,617,606)
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	(781,415)	(125,974)
Amounts due to subsidiaries and affiliates	0	(109,252)
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(1,214,254)	(8,235)
Total liabilities	(1,995,669)	(243,461)
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	(5,837,314)	(7,374,145)
Total liabilities, noncontrolling interests and shareholders’ equity	$ (7,832,983)	$ (7,617,606)