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Variable Interest Entities (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jan. 10, 2020 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | $ 27,465,519,000 |  | $ 26,330,094,000 |  |
Liabilities | 18,550,147,000 |  | 17,287,419,000 |  |
Redeemable noncontrolling interests | 3,231,846,000 |  | 3,071,308,000 |  |
Ceded premiums written | 755,913,000 | $ 635,264,000 |  |  |
Ceded premiums earned | 370,864,000 | 305,219,000 |  |  |
Reinsurance recoverable | 2,765,583,000 | 2,908,343,000 | 2,791,297,000 |  |
Investments in other ventures, under equity method | 90,396,000 |  | 106,549,000 |  |
Vermeer Reinsurance Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Redeemable noncontrolling interests | 1,021,478,000 | 605,197,000 | 1,003,615,000 |  | $ 599,989,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | 3,400,000,000 |  | 3,100,000,000 |  |
Liabilities | 3,400,000,000 |  | 3,100,000,000 |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Payments of capital distribution | 81,800,000 |  | 279,200,000 |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Contributions to subsidiaries | 620,900,000 |  | 618,700,000 |  |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Payments of capital distribution | $ 29,900,000 |  | $ 31,000,000.0 |  |
Variable interest entity, ownership percentage | 14.20% |  | 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 | $ 75,400,000 |  | $ 100,000,000.0 |  |
Variable Interest Entity, Primary Beneficiary | Vermeer Reinsurance Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | 1,000,000,000.0 |  | 1,000,000,000.0 |  |
Liabilities | 27,300,000 |  | 23,200,000 |  |
Redeemable noncontrolling interests | 1,000,000,000.0 |  | 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 | 0 | 6,000 |  |  |
Ceded premiums earned | 0 | 6,000 |  |  |
Ceded net claims and claim expenses | 1,100,000 | 7,500,000 |  |  |
Reinsurance recoverable | 6,400,000 |  | 7,500,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | 424,700,000 | 6,000 |  |  |
Liabilities | 424,700,000 | 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 | 2,900,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | DaVinci Reinsurance Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ceded premiums written | 7,300,000 | 0 |  |  |
Ceded premiums earned | 1,800,000 | 0 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Renaissance Reinsurance Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ceded premiums written | 29,200,000 | 0 |  |  |
Ceded premiums earned | 7,300,000 | $ 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 |  |
Variable Interest Entity, Not Primary Beneficiary | Langhorne Holdings LLC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investments in other ventures, under equity method | 1,800,000 |  | 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 |  |

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195 + Details
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