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Variable Interest Entities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |  |
Total assets | $ 26,330,094,000 |  | $ 18,676,196,000 |
Total liabilities | 17,287,419,000 |  | 11,579,416,000 |
Redeemable noncontrolling interests | 3,071,308,000 |  | 2,051,700,000 |
Ceded premiums written | 1,426,257,000 |  | 1,178,525,000 | $ 926,215,000
Ceded premiums earned | 1,414,383,000 |  | 1,095,886,000 | 833,929,000
Reinsurance recoverable | 2,791,297,000 |  |  |
Investments in other ventures, under equity method (Note 5) | 106,549,000 |  | 115,172,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 3,100,000,000 |  | 2,200,000,000 |
Total liabilities | 3,100,000,000 |  | 2,200,000,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payments of capital distributions | 279,200,000 |  |  |
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment in variable interest entity | $ 618,700,000 | $ 512,800,000 | 856,700,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payments of capital distributions |  |  | $ 31,000,000.0 |
Variable interest entity, ownership percentage | 16.50% |  | 14.00% |
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. | Non-voting preference shares |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment in variable interest entity | $ 100,000,000.0 |  | $ 109,800,000 |
Vermeer Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Redeemable noncontrolling interests | 1,003,615,000 |  | 599,989,000 | 0
Vermeer Reinsurance Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 1,000,000,000.0 |  | 600,400,000 |
Total liabilities | 23,200,000 |  | 400,000 |
Redeemable noncontrolling interests | 1,000,000,000.0 |  | 600,000,000.0 |
Mona Lisa Re | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 6,000 |  | 41,000 |
Total liabilities | 6,000 |  | 41,000 |
Mona Lisa Re | Not Primary Beneficiary | Renaissance Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written | 0 |  | 200,000 | 400,000
Ceded premiums earned | 0 |  | 200,000 | 4,100,000
Mona Lisa Re | Not Primary Beneficiary | DaVinci Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written | 0 |  |  |
Ceded premiums earned | 0 |  | 200,000 | $ 2,900,000
Fibonacci Reinsurance Ltd. | Not Primary Beneficiary | Other investments |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Fair value of investment | 400,000 |  | 6,000,000.0 |
Renaissance Reinsurance Ltd. | Not Primary Beneficiary | Fibonacci Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written | 100,000 |  | 9,100,000 |
Ceded premiums earned | 100,000 |  | 10,000,000.0 |
Ceded net claims and claim expenses | 7,500,000 |  | 0 |
Reinsurance recoverable | 7,500,000 |  | 0 |
Langhorne Holdings LLC | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investments in other ventures, under equity method (Note 5) | 1,700,000 |  | 1,300,000 |
Langhorne Partners | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investments in other ventures, under equity method (Note 5) | $ 100,000 |  | $ 100,000 |

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