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

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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jun. 29, 2017	May 04, 2015	Mar. 24, 2015
Debt Instrument [Line Items]
Senior notes, fair value	$ 974,700	$ 1,000,000
Long-term debt	$ 991,127	989,623
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%
5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Interest rate	5.75%
4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Interest rate	4.75%
RenaissanceRe Finance, Inc. \| 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
Debt Instrument [Line Items]
Senior notes, fair value	$ 974,714	1,018,235
Long-term debt	991,127	989,623
Senior Notes \| RenaissanceRe Finance, Inc. \| 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate			3.45%
Senior notes, fair value	283,680	294,654
Long-term debt	295,797	295,303
Senior Notes \| RenaissanceRe Finance, Inc. \| 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Senior notes, fair value	292,557	302,781
Long-term debt	297,688	297,318
Senior Notes \| RenaissanceRe Finance, Inc. \| 5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes, fair value	255,938	263,750
Long-term debt	249,602	249,272
Senior Notes \| DaVinciRe Holdings Ltd. \| 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Senior notes, fair value	142,539	157,050
Long-term debt	$ 148,040	$ 147,730