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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 |  |  |  |

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