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Variable Interest Entities - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 10, 2023 note | Jul. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) account | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 29, 2021 USD ($) | Jan. 10, 2020 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of segregated accounts | account |  |  |  | 4 |  |  |  |
Total assets |  |  |  | $ 49,007,105,000 | $ 36,552,878,000 |  |  |
Total liabilities |  |  |  | 33,451,316,000 | 26,692,215,000 |  |  |
Investments in other ventures, under equity method (Note 5) |  |  |  | 112,624,000 | 79,750,000 |  |  |
Redeemable noncontrolling interest, equity, carrying amount |  |  |  | 6,100,831,000 | 4,535,389,000 |  |  |
Ceded premiums written |  |  |  | 1,394,553,000 | 2,017,380,000 | $ 1,894,423,000 |  |
Ceded premiums earned |  |  |  | 1,614,432,000 | 1,850,807,000 | 1,863,350,000 |  |
Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, equity, carrying amount |  |  |  | 1,555,297,000 | 1,490,840,000 | 1,197,782,000 |  |
Fontana Holdings L.P. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, equity, carrying amount |  |  |  | 353,823,000 | 268,031,000 | 0 |  |
Primary Beneficiary | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 2,400,000,000 | 3,700,000,000 |  |  |
Total liabilities |  |  |  | 2,400,000,000 | 3,700,000,000 |  |  |
Net assets |  |  |  | 74,200,000 | 165,300,000 |  |  |
Primary Beneficiary | Investors of Upsilon RFO Diversified I, II and III | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distributions |  |  |  | 988,500,000 |  |  |  |
Net assets |  |  |  | 500,000,000 | 1,200,000,000 |  |  |
Primary Beneficiary | Investors of Upsilon RFO Diversified I, II and III | Upsilon RFO Re Ltd. | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 39,800,000 |  |  |  |
Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distributions |  |  |  | $ 125,500,000 | $ 83,100,000 |  |  |
Variable interest entity, ownership percentage |  |  |  | 14.30% | 12.70% |  |  |
Primary Beneficiary | RenaissanceRe Holdings Ltd. | Upsilon RFO Re Ltd. | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | $ 10,200,000 | $ 10,000,000 |  |  |
Primary Beneficiary | Investor | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distributions |  |  |  |  | 508,900,000 |  |  |
Primary Beneficiary | Investor | Upsilon RFO Re Ltd. | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  |  | 89,000,000 |  |  |
Not Primary Beneficiary | RenaissanceRe Upsilon Diversified Fund |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investments in other ventures, under equity method (Note 5) |  |  |  | 800,000 | 1,900,000 |  |  |
Not Primary Beneficiary | NOC1 |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investments in other ventures, under equity method (Note 5) |  |  |  | 1,700,000 |  |  |  |
Not Primary Beneficiary | Alpha Cat entities |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investments in other ventures, under equity method (Note 5) |  |  |  | 4,400,000 |  |  |  |
Not Primary Beneficiary | RenaissanceRe Upsilon Diversified Fund |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 600,800,000 | 1,200,000,000 |  |  |
Total liabilities |  |  |  | 108,000,000.0 | 32,100,000 |  |  |
Not Primary Beneficiary | RenaissanceRe Upsilon Diversified Fund | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment owned, fair value |  |  |  | 503,100,000 | 1,200,000,000 |  |  |
Not Primary Beneficiary | NOC1 |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 196,500,000 |  |  |  |
Total liabilities |  |  |  | 22,800,000 |  |  |  |
Not Primary Beneficiary | Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 1,700,000,000 | 1,600,000,000 |  |  |
Total liabilities |  |  |  | 102,700,000 | 144,900,000 |  |  |
Redeemable noncontrolling interest, equity, carrying amount |  |  |  | 1,600,000,000 | 1,500,000,000 |  |  |
Not Primary Beneficiary | Fontana Holdings L.P. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 1,500,000,000 | 711,000,000 |  |  |
Total liabilities |  |  |  | 968,500,000 | 319,200,000 |  |  |
Redeemable noncontrolling interest, equity, carrying amount |  |  |  | 353,800,000 | 268,000,000 |  |  |
Not Primary Beneficiary | Mona Lisa Re |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 436,900,000 | 654,800,000 |  |  |
Total liabilities |  |  |  | 436,900,000 | 654,800,000 |  |  |
Face amount |  |  |  |  |  |  | $ 250,000,000 |
Number of variable notes issued | note | 2 |  |  |  |  |  |  |
Not Primary Beneficiary | Mona Lisa Re | Other investments |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Fair value of investment |  |  |  | 2,200,000 | 5,700,000 |  |  |
Not Primary Beneficiary | Mona Lisa Re | $250 Million Principal-At-Risk Note |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 250,000,000
Not Primary Beneficiary | Mona Lisa Re | $150 Million Principal-At-Risk Note |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 150,000,000
Not Primary Beneficiary | Tailwind Re Ltd |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 417,100,000 |  |  |  |
Total liabilities |  |  |  | 417,100,000 |  |  |  |
Not Primary Beneficiary | Tailwind Re Ltd | Other investments |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Fair value of investment |  |  |  | 800,000 |  |  |  |
Not Primary Beneficiary | Alpha Cat entities |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | 5,000,000,000 |  |  |  |
Total liabilities |  |  |  | 2,400,000,000 |  |  |  |
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | RenaissanceRe Upsilon Diversified Fund |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distributions |  |  |  | 1,200,000 | 0 |  |  |
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | RenaissanceRe Upsilon Diversified Fund | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 100,000 | 0 |  |  |
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | NOC1 | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 1,600,000 |  |  |  |
Not Primary Beneficiary | RenaissanceRe Holdings Ltd. | Langhorne Holdings LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distributions |  | $ 800,000 | $ 1,500,000 |  |  |  |  |
Not Primary Beneficiary | Investors of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Net assets |  |  |  |  | 88,300,000 |  |  |
Not Primary Beneficiary | Investors of Upsilon RFO Diversified IV | Upsilon RFO Re Ltd. | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 81,400,000 |  |  |  |
Not Primary Beneficiary | Investor | RenaissanceRe Upsilon Diversified Fund |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payments of capital distributions |  |  |  | 844,100,000 | 143,500,000 |  |  |
Not Primary Beneficiary | Investor | RenaissanceRe Upsilon Diversified Fund | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 30,000,000.0 | 82,500,000 |  |  |
Not Primary Beneficiary | Investor | NOC1 | Preference shares |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Investment in variable interest entity |  |  |  | 161,500,000 |  |  |  |
Not Primary Beneficiary | Renaissance Reinsurance | Mona Lisa Re |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ceded premiums written |  |  |  | 32,800,000 | 39,600,000 | 39,500,000 |  |
Ceded premiums earned |  |  |  | 32,800,000 | 39,400,000 | 32,500,000 |  |
Not Primary Beneficiary | DaVinci Reinsurance | Mona Lisa Re |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ceded premiums written |  |  |  | 8,200,000 | 9,900,000 | 9,900,000 |  |
Ceded premiums earned |  |  |  | 8,200,000 | $ 9,800,000 | $ 8,100,000 |  |
Not Primary Beneficiary | Validus | Tailwind Re Ltd |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ceded premiums written |  |  |  | 0 |  |  |  |
Ceded premiums earned |  |  |  | $ 6,500,000 |  |  |  |

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