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Variable Interest Entities (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |
Total assets | $ 30,820,580,000 | $ 30,820,580,000 | $ 26,330,094,000 |
Total liabilities | 19,872,013,000 | 19,872,013,000 | 17,287,419,000 |
Redeemable noncontrolling interests | 3,388,319,000 | 3,388,319,000 | 3,071,308,000 |
Ceded premiums written |  | 1,709,832,000 | 1,426,257,000 | $ 1,178,525,000
Ceded premiums earned |  | 1,662,815,000 | 1,414,383,000 | 1,095,886,000
Reinsurance Recoverable | 2,926,010,000 | 2,926,010,000 | 2,791,297,000 | 2,372,221,000
Investments in other ventures, under equity method (Note 5) | 98,373,000 | $ 98,373,000 | 106,549,000 |
Primary Beneficiary | Upsilon RFO |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Variable interest entity, ownership percentage |  | 85.00% |  |
Upsilon RFO Re Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 3,800,000,000 | $ 3,800,000,000 | 3,100,000,000 |
Total liabilities | 3,800,000,000 | 3,800,000,000 | 3,100,000,000 |
Net assets | 270,000,000.0 | 270,000,000.0 |  |
Upsilon RFO Re Ltd. | Investor | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payments of capital distributions |  | 586,000,000.0 | 279,200,000 |
Net assets | 1,700,000,000 | 1,700,000,000 |  |
Upsilon RFO Re Ltd. | Investor | Non-voting preference shares | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment in variable interest entity | 620,300,000 | $ 835,900,000 | $ 618,700,000 |
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Variable interest entity, ownership percentage |  | 13.80% | 16.50% |
Payments of capital distributions |  | $ 102,900,000 | $ 31,000,000.0 |
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-voting preference shares | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment in variable interest entity |  | 98,100,000 | 100,000,000.0 |
Vermeer Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Redeemable noncontrolling interests | 1,109,627,000 | 1,109,627,000 | 1,003,615,000 | 599,989,000
Vermeer Reinsurance Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 1,100,000,000 | 1,100,000,000 | 1,000,000,000.0 |
Total liabilities | 36,700,000 | 36,700,000 | 23,200,000 |
Redeemable noncontrolling interests | 1,100,000,000 | 1,100,000,000 | 1,000,000,000.0 |
Mona Lisa Re | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 400,300,000 | 400,300,000 | 6,000 |
Total liabilities | 400,300,000 | 400,300,000 | 6,000 |
Mona Lisa Re | Other Investments | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Fair value of investment | 3,700,000 | 3,700,000 |  |
Mona Lisa Re | Renaissance Reinsurance Ltd. | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written |  | 24,300,000 | 0 | 200,000
Ceded premiums earned |  | 24,300,000 | 0 | 200,000
Mona Lisa Re | DaVinci Reinsurance Ltd. | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written |  | 6,700,000 |  |
Ceded premiums earned |  | 6,700,000 | 0 | 200,000
Fibonacci Reinsurance Ltd. | Other Investments | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Fair value of investment | 0 | 0 | 400,000 |
Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written |  | 200,000 | 100,000 | 9,100,000
Ceded premiums earned |  | 200,000 | 100,000 | 10,000,000.0
Ceded net claims and claim expenses |  | 7,500,000 | 7,500,000 | $ 0
Reinsurance Recoverable | 0 | 0 | 7,500,000 |
Langhorne Holdings LLC | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investments in other ventures, under equity method (Note 5) | 2,000,000.0 | 2,000,000.0 | 1,700,000 |
Langhorne Partners | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investments in other ventures, under equity method (Note 5) | $ 100,000 | $ 100,000 | $ 100,000 |

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