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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, 2021 | Dec. 31, 2020 | Apr. 02, 2019 | Jun. 29, 2017 | May 04, 2015 | Mar. 24, 2015
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 1,300,000 | $ 1,300,000 |  |  |  |
Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 1,268,443 | 1,261,069 |  |  |  |
Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 1,168,353 | 1,136,265 |  |  |  |
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 | Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 432,316 | 453,932 |  |  |  |
Senior Notes | RenaissanceRe Finance, Inc. | 3.600% Senior Notes due 2029 | Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 393,305 | 392,391 |  |  |  |
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027 | Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 321,204 | 329,661 |  |  |  |
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027 | Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 297,281 | 296,787 |  |  |  |
Senior Notes | RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025 | Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 318,852 | 315,273 |  |  |  |
Senior Notes | RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025 | Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 298,798 | 298,428 |  |  |  |
Senior Notes | DaVinciRe Holdings Ltd. | Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 1,238,443 | 1,261,069 |  |  |  |
Senior Notes | DaVinciRe Holdings Ltd. | Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 1,138,353 | 1,136,265 |  |  |  |
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe) | Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 166,071 | 162,203 |  |  |  |
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe) | Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 148,969 | 148,659 |  |  |  |
Line of Credit | DaVinciRe Holdings Ltd. | Estimate of Fair Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 30,000 | 0 |  |  |  |
Line of Credit | DaVinciRe Holdings Ltd. | Reported Value Measurement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 30,000 | $ 0 |  |  |  |

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