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Noncontrolling Interests (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2017 | Jul. 31, 2017 | Jan. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2017 | Jan. 01, 2017 | Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | $ 1,533,978 |  | $ 1,533,978 |  | $ 1,296,506 |  |  |  |  |
Net income (loss) attributable to redeemable noncontrolling interests |  |  |  | $ 6,440 | $ (204,277) | $ 90,822 | $ (132,338) |  |  |  |  |  |
DaVinci Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Parent company ownership in redeemable noncontrolling interest | 22.10% |  |  | 22.10% |  | 22.10% |  | 22.10% |  | 23.50% |  | 22.60% |
RenaissanceRe Medici Fund Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Parent company ownership in redeemable noncontrolling interest |  |  |  | 15.80% |  | 15.80% |  | 26.80% |  |  |  |  |
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | $ 1,085,985 | 812,342 | $ 1,085,985 | 812,342 | $ 1,011,659 | $ 1,082,425 |  | $ 1,019,918 |  | $ 994,458
Net income (loss) attributable to redeemable noncontrolling interests |  |  |  | 3,730 | (195,508) | 74,935 | (127,167) |  |  |  |  |  |
Redeemable noncontrolling interest, net redemptions |  |  | $ 75,000 |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, reserve holdback |  |  | 7,500 |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, change from purchase or sale of interests | $ 49,700 | $ 12,000 | $ 24,000 |  |  |  |  |  |  |  |  |  |
Issuance of equity to third party investors | $ 248,600 |  |  |  |  |  |  |  |  |  |  |  |
Sale of shares to redeemable noncontrolling interest |  |  |  | 0 | 0 | 0 | 23,921 |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interest |  |  |  | $ 170 | 12,068 | $ 609 | 78,870 |  |  |  |  |  |
DaVinciRe Holdings Ltd. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase requests, limit |  |  |  | 25.00% |  | 25.00% |  |  |  |  |  |  |
RenaissanceRe Medici Fund Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | $ 447,993 | 221,387 | $ 447,993 | 221,387 | 284,847 | $ 411,003 |  | $ 222,165 |  | $ 181,136
Net income (loss) attributable to redeemable noncontrolling interests |  |  |  | 2,710 | (8,769) | $ 15,887 | (5,171) |  |  |  |  |  |
Redemption provision, notice period |  |  |  |  |  | 30 days |  |  |  |  |  |  |
Sale of shares to redeemable noncontrolling interest |  |  |  | 43,000 | 9,391 | $ 199,482 | 72,732 | 149,200 |  |  |  |  |
Redemption of shares from redeemable noncontrolling interest |  |  |  | $ 8,720 | $ 1,400 | $ 52,223 | $ 27,310 | $ 48,000 |  |  |  |  |

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- Definition This item limits the aggregate of all share repurchase requests to 25% of DaVinciRe's capital in any given year and satisfying all applicable regulatory requirements. If total shareholder requests exceed 25% of DaVinciRe's capital, the number of shares repurchased will be reduced among the requesting shareholders pro-rata, based on the amounts desired to be repurchased. + References No definition available. + Details
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- Definition Reserve holdback. + References No definition available. + Details
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- Definition Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 + Details
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- Definition The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686 + Details
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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