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Variable Interest Entities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |  |
Total assets | $ 18,676,196,000 |  | $ 15,226,131,000 |
Total liabilities | 11,579,416,000 |  | 9,538,250,000 |
Ceded premiums written | 1,178,525,000 |  | 926,215,000 | $ 839,264,000
Ceded premiums earned | 1,095,886,000 |  | 833,929,000 | 628,675,000
Investments in other ventures, under equity method (Note 4) | 115,172,000 |  | 101,974,000 |
Redeemable noncontrolling interests | 2,051,700,000 |  | 1,296,506,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Return of capital |  |  | 84,300,000 |
Total assets | 2,200,000,000 |  | 1,200,000,000 |
Total liabilities | 2,200,000,000 |  | 1,200,000,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary | Non-voting preference shares |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Non-voting preference shares issued to third parties |  |  | 180,600,000 |
Investment in variable interest entity | $ 109,800,000 |  | 27,200,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Return of capital |  |  | $ 33,000,000 |
Variable interest entity, ownership percentage | 14.00% |  | 20.80% |
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investment in variable interest entity | $ 856,700,000 | $ 400,000,000 | $ 7,500,000 |
Mona Lisa Re Ltd. | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 41,000 |  | 25,900,000 |
Total liabilities | 41,000 |  | 25,900,000 |
Mona Lisa Re Ltd. | Not Primary Beneficiary | Renaissance Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written | 200,000 |  | 400,000 |
Ceded premiums earned | 200,000 |  | 4,100,000 |
Mona Lisa Re Ltd. | Not Primary Beneficiary | DaVinci Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written | 200,000 |  | 400,000 |
Ceded premiums earned | 200,000 |  | 2,900,000 |
Fibonacci Reinsurance Ltd. | Not Primary Beneficiary | Other investments |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Fair value of investment | 6,000,000 |  | 14,100,000 |
Renaissance Reinsurance Ltd. | Not Primary Beneficiary | Fibonacci Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ceded premiums written | 9,100,000 |  | 9,000,000 |
Ceded premiums earned | 10,000,000 |  | 8,200,000 |
Langhorne Holdings LLC | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investments in other ventures, under equity method (Note 4) | 1,300,000 |  | 600,000 |
Langhorne Partners | Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Investments in other ventures, under equity method (Note 4) | 100,000 |  | 0 |
Vermeer Reinsurance Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Redeemable noncontrolling interests | 599,989,000 |  | $ 0 | $ 0
Vermeer Reinsurance Ltd. | Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 600,400,000 |  |  |
Total liabilities | $ 400,000 |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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