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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jun. 29, 2017 | Jun. 01, 2017 | Dec. 31, 2016 | May 04, 2015 | Mar. 24, 2015
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Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | $ 1,018,200 |  |  | $ 964,800 |  |
Long-term debt | $ 989,623 |  |  | $ 948,663 |  |
3.450% Senior Notes due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate | 3.45% |  |  |  |  |
3.700% Senior Notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate | 3.70% |  |  |  |  |
5.75% Senior Notes due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate | 5.75% |  |  |  |  |
Series B 7.50% Senior Notes due 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate |  |  |  | 7.50% |  |
4.750% Senior Notes due 2025 (DaVinciRe) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate | 4.75% |  |  |  |  |
RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  | 3.70%
DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate |  |  |  |  | 4.75% |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | $ 1,018,235 |  |  | $ 964,800 |  |
Long-term debt | 989,623 |  |  | 948,663 |  |
Senior Notes | 3.700% Senior Notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | 302,781 |  |  | 291,750 |  |
Long-term debt | 297,318 |  |  | 296,948 |  |
Senior Notes | 5.75% Senior Notes due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | 263,750 |  |  | 270,875 |  |
Long-term debt | 249,272 |  |  | 248,941 |  |
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate |  | 3.45% |  |  |  |
Long-term debt, fair value | 294,654 |  |  | 0 |  |
Long-term debt | 295,303 |  |  | 0 |  |
Senior Notes | Platinum Underwriters Finance, Inc | Series B 7.50% Senior Notes due 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes interest rate |  |  | 7.50% |  |  |
Long-term debt, fair value | 0 |  |  | 257,500 |  |
Long-term debt | 0 |  |  | 255,352 |  |
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | 157,050 |  |  | 144,675 |  |
Long-term debt | $ 147,730 |  |  | $ 147,422 |  |

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