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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,200,000 | $ 1,300,000
Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,232,755 | 1,261,069
Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,137,829 | 1,136,265
3.600% Senior Notes due 2029 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.60% |
3.450% Senior Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.45% |
3.700% Senior Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.70% |
4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.75% |
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc. | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 436,712 | 453,932
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc. | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 393,076 | 392,391
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 326,406 | 329,661
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 297,157 | 296,787
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc. | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 309,276 | 315,273
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc. | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 298,705 | 298,428
Senior Notes | 4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd. | Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 160,361 | 162,203
Senior Notes | 4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd. | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 148,891 | $ 148,659

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