Schedule II. Condensed Financial Information Of Registrant (Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Fixed maturity investments	$ 11,171,655	$ 8,088,870
Cash and cash equivalents	1,379,068	1,107,922
Investments in subsidiaries	0	0
Accrued investment income	72,461	51,311
Receivable for investments sold	78,369	256,416
Other assets	346,216	135,127
Goodwill and other intangible assets	262,226	237,418
Total assets	26,330,094	18,676,196
Liabilities
Due to subsidiaries	0	0
Other liabilities	932,024	513,609
Total liabilities	17,287,419	11,579,416
Shareholders’ Equity
Preference shares: $1.00 par value – 16,010,000 shares issued and outstanding at December 31, 2019 (2018 – 16,010,000)	650,000	650,000
Common shares: $1.00 par value – 44,148,116 shares issued and outstanding at December 31, 2019 (2018 – 42,207,390)	44,148	42,207
Additional paid-in capital	568,277	296,099
Accumulated other comprehensive loss	(1,939)	(1,433)
Retained earnings	4,710,881	4,058,207
Total shareholders’ equity attributable to RenaissanceRe	5,971,367	5,045,080	$ 4,391,375
Total liabilities, noncontrolling interests and shareholders’ equity	26,330,094	18,676,196
Parent Company
Assets
Fixed maturity investments	1,005	240,443
Short term investments, at fair value (Notes 4 and 5)	189,446	72,917
Cash and cash equivalents	26,460	3,534
Investments in subsidiaries	5,204,260	4,414,475
Due from subsidiaries	10,725	57,039
Accrued investment income	0	1,046
Receivable for investments sold	173	203
Other assets	847,406	458,842
Goodwill and other intangible assets	116,212	120,476
Total assets	6,395,687	5,368,975
Liabilities
Notes and bank loans payable	391,475	300,000
Due to subsidiaries	6,708	6,453
Other liabilities	26,137	17,442
Total liabilities	424,320	323,895
Shareholders’ Equity
Preference shares: $1.00 par value – 16,010,000 shares issued and outstanding at December 31, 2019 (2018 – 16,010,000)	650,000	650,000
Common shares: $1.00 par value – 44,148,116 shares issued and outstanding at December 31, 2019 (2018 – 42,207,390)	44,148	42,207
Additional paid-in capital	568,277	296,099
Accumulated other comprehensive loss	(1,939)	(1,433)
Retained earnings	4,710,881	4,058,207
Total shareholders’ equity attributable to RenaissanceRe	5,971,367	5,045,080
Total liabilities, noncontrolling interests and shareholders’ equity	$ 6,395,687	$ 5,368,975