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Debt and Credit Facilities (Debt Obligations Narrative) (Details) - USD ($) | Apr. 02, 2019 | Dec. 31, 2019 | Jun. 29, 2017 | May 04, 2015 | Mar. 24, 2015 | Mar. 17, 2010 | Nov. 02, 2005
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Bridge Loan | Platinum Underwriters Holdings, Ltd. |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 300,000,000.0 |  |
Senior Notes | 3.600% Senior Notes due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 3.60% | 3.60% |  |  |  |  |
Face amount | $ 400,000,000.0 |  |  |  |  |  |
Repayments of long-term lines of credit | $ 200,000,000.0 |  |  |  |  |  |
Senior Notes | 3.450% Senior Notes due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  | 3.45% |  |  |  |  |
Senior Notes | 3.700% Senior Notes due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  | 3.70% |  |  |  |  |
Senior Notes | 5.75% Senior Notes Due March 15, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  | 5.75% |  |  |  |  |
Senior Notes | 4.750% Senior Notes Due May 1, 2025 |  |  |  |  |  |  |
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% |  |
Face amount |  |  |  |  | $ 300,000,000.0 |  |
RenaissanceRe Finance, Inc. | Senior Notes | 3.450% Senior Notes due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 3.45% |  |  |  |
Face amount |  |  | $ 300,000,000.0 |  |  |  |
RenRe North America Holdings Inc | 5.75% Senior Notes Due March 15, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.75% |
Face amount |  |  |  |  |  | $ 250,000,000.0 |
Platinum Underwriters Finance, Inc | Senior Notes | Series B 7.50% Notes Due June 1, 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 7.50%
Face amount |  |  |  |  |  |  | $ 250,000,000.0
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loan agreement with related party |  |  |  | $ 100,000,000.0 |  |  |
DaVinciRe Holdings Ltd. | 4.750% Senior Notes Due May 1, 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  | 4.75% |  |  |
Face amount |  |  |  | $ 150,000,000.0 |  |  |

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