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Variable Interest Entities (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Jan. 10, 2020 | Mar. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Assets | $ 30,479,754,000 |  | $ 30,479,754,000 |  | $ 26,330,094,000 |  |  |  |
Liabilities | 19,745,483,000 |  | 19,745,483,000 |  | 17,287,419,000 |  |  |  |
Redeemable noncontrolling interests | 3,387,099,000 |  | 3,387,099,000 |  | 3,071,308,000 |  |  |  |
Ceded premiums written | 521,069,000 | $ 453,943,000 | 1,276,982,000 | $ 1,089,207,000 |  |  |  |  |
Ceded premiums earned | 409,588,000 | 381,280,000 | 780,452,000 | 686,499,000 |  |  |  |  |
Reinsurance recoverable | 2,774,358,000 | 2,865,150,000 | 2,774,358,000 | 2,865,150,000 | 2,791,297,000 |  |  |  |
Investments in other ventures, under equity method | 94,285,000 |  | 94,285,000 |  | 106,549,000 |  |  |  |
Vermeer Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 1,083,681,000 | 765,450,000 | 1,083,681,000 | 765,450,000 | 1,003,615,000 | $ 1,021,478,000 |  | $ 605,197,000 | $ 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 | 301,100,000 |  | 301,100,000 |  |  |  |  |  |
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 | 1,100,000,000 |  | 1,100,000,000 |  | 1,000,000,000.0 |  |  |  |
Liabilities | 59,800,000 |  | 59,800,000 |  | 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 | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ceded premiums written |  |  | 8,000 | 47,000 |  |  |  |  |
Ceded premiums earned |  |  | 8,000 | 47,000 |  |  |  |  |
Ceded net claims and claim expenses |  |  | 1,100,000 | 7,500,000 |  |  |  |  |
Reinsurance recoverable | 6,400,000 |  | 6,400,000 |  | 7,500,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Assets | 416,100,000 | 6,000 | 416,100,000 | 6,000 |  |  |  |  |
Liabilities | 416,100,000 | $ 6,000 | 416,100,000 | 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 | 2,700,000 |  | 2,700,000 |  |  |  |  |  |
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 |  |  | 3,400,000 | 0 |  |  |  |  |
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 |  |  | 12,100,000 | $ 0 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other investments |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Investment in participating notes | 400,000 |  | 400,000 |  | 400,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Langhorne Holdings LLC |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Investments in other ventures, under equity method | 1,900,000 |  | 1,900,000 |  | 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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