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Debt and Credit Facilities (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Apr. 02, 2019	Jun. 29, 2017	May 04, 2015	Mar. 24, 2015
Debt Instrument [Line Items]
Fair Value	$ 1,261,069	$ 1,468,618
Carrying Value	1,136,265	1,384,105
3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate			3.60%
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate				3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate						3.70%
DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Interest rate					4.75%
Senior Notes | RenaissanceRe Finance, Inc. | 3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Fair Value	453,932	424,920
Carrying Value	392,391	391,475
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Fair Value	329,661	314,070
Carrying Value	296,787	296,292
Senior Notes | RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Fair Value	315,273	318,567
Carrying Value	298,428	298,057
Senior Notes | RenaissanceRe Finance, Inc. | 5.750% Senior Notes due 2020 (1)
Debt Instrument [Line Items]
Fair Value	0	251,030
Carrying Value	0	249,931
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Fair Value	162,203	160,031
Carrying Value	$ 148,659	$ 148,350

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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