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Variable Interest Entities (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jun. 30, 2020 | Jan. 10, 2020 | Jun. 30, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Assets | $ 30,995,840,000 |  | $ 30,995,840,000 |  | $ 26,330,094,000 |  |  |  |
Liabilities | 20,217,702,000 |  | 20,217,702,000 |  | 17,287,419,000 |  |  |  |
Redeemable noncontrolling interests | 3,387,317,000 |  | 3,387,317,000 |  | 3,071,308,000 |  |  |  |
Ceded premiums written | 243,647,000 | $ 156,938,000 | 1,520,629,000 | $ 1,246,145,000 |  |  |  |  |
Ceded premiums earned | 430,309,000 | 343,529,000 | 1,210,761,000 | 1,030,028,000 |  |  |  |  |
Reinsurance recoverable | 2,883,808,000 | 2,438,299,000 | 2,883,808,000 | 2,438,299,000 | 2,791,297,000 |  |  |  |
Investments in other ventures, under equity method | 98,990,000 |  | 98,990,000 |  | 106,549,000 |  |  |  |
Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 1,095,635,000 | $ 781,738,000 | 1,095,635,000 | 781,738,000 | 1,003,615,000 | $ 1,083,681,000 |  | $ 765,450,000 | $ 599,989,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Assets | 3,500,000,000 |  | 3,500,000,000 |  | 3,100,000,000 |  |  |  |
Liabilities | 3,500,000,000 |  | 3,500,000,000 |  | 3,100,000,000 |  |  |  |
Net assets | 291,000,000.0 |  | 291,000,000.0 |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | 302,000,000.0 |  | 279,200,000 |  |  |  |
Net assets | 1,800,000,000 |  | 1,800,000,000 |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  | 802,000,000.0 |  | 618,700,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Payments of capital distribution |  |  | $ 61,600,000 |  | $ 31,000,000.0 |  |  |  |
Variable interest entity, ownership percentage |  |  | 13.90% |  | 16.50% |  |  |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Contributions to subsidiaries |  |  | $ 95,400,000 |  | $ 100,000,000.0 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Assets | 1,300,000,000 |  | 1,300,000,000 |  | 1,000,000,000.0 |  |  |  |
Liabilities | 250,100,000 |  | 250,100,000 |  | 23,200,000 |  |  |  |
Redeemable noncontrolling interests | 1,100,000,000 |  | 1,100,000,000 |  | 1,000,000,000.0 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Assets | 408,100,000 |  | 408,100,000 |  | 6,000 |  |  |  |
Liabilities | 408,100,000 |  | 408,100,000 |  | 6,000 |  |  |  |
Face amount |  |  |  |  |  |  | $ 400,000,000.0 |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Other investments |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Investment in participating notes | 2,800,000 |  | 2,800,000 |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Renaissance Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ceded premiums written |  |  | 24,300,000 | 0 |  |  |  |  |
Ceded premiums earned |  |  | 18,200,000 | 0 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | DaVinci Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ceded premiums written |  |  | 6,700,000 | 0 |  |  |  |  |
Ceded premiums earned |  |  | 5,100,000 | 0 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ceded premiums written |  |  | 11,000 | 100,000 |  |  |  |  |
Ceded premiums earned |  |  | 11,000 | 100,000 |  |  |  |  |
Ceded net claims and claim expenses |  |  | 7,500,000 | $ 7,500,000 |  |  |  |  |
Reinsurance recoverable | 0 |  | 0 |  | 7,500,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other investments |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Investment in participating notes | 1,000,000.0 |  | 1,000,000.0 |  | 400,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Langhorne Holdings LLC |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Investments in other ventures, under equity method | 2,000,000.0 |  | 2,000,000.0 |  | 1,700,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Langhorne Partners |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Investments in other ventures, under equity method | $ 100,000 |  | $ 100,000 |  | $ 100,000 |  |  |  |

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