| Document and Entity Information | Jul. 07, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 7, 2021 |
| Entity Registrant Name | RenaissanceRe Holdings Ltd. |
| Entity Incorporation, State or Country Code | D0 |
| Entity File Number | 001-14428 |
| Entity Tax Identification Number | 98-0141974 |
| Entity Address, Address Line One | Renaissance House |
| Entity Address, Address Line Two | 12 Crow Lane |
| Entity Address, City or Town | Pembroke |
| Entity Address, Postal Zip Code | HM 19 |
| Entity Address, Country | BM |
| City Area Code | 441 |
| Local Phone Number | 295-4513 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000913144 |
| Amendment Flag | false |
| Common Stock [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Shares, Par Value $1.00 per share |
| Trading Symbol | RNR |
| Security Exchange Name | NYSE |
| Series E 5.375% Preference Shares, Par Value $1.00 per share [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Series E 5.375% Preference Shares, Par Value $1.00 per share |
| Trading Symbol | RNR PRE |
| Security Exchange Name | NYSE |
| Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share |
| Trading Symbol | RNR PRF |
| Security Exchange Name | NYSE |
