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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

X

- 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.

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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.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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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.

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