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Noncontrolling Interests (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017	Jan. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jul. 01, 2017	Jun. 30, 2017	Jan. 01, 2017	Jun. 30, 2016	Jan. 01, 2016	Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests				$ 1,033,729		$ 1,033,729		$ 1,175,594
Net (loss) income attributable to redeemable noncontrolling interests				(204,277)	$ 35,641	(132,338)	$ 110,867
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests				812,342	983,788	812,342	983,788	$ 994,458		$ 1,019,918		$ 953,443		$ 930,955
Net (loss) income attributable to redeemable noncontrolling interests				$ (195,508)	30,745	$ (127,167)	101,997
Parent company ownership in redeemable noncontrolling interest				23.50%		23.50%		24.00%	23.50%		22.60%		24.00%
Redeemable noncontrolling interest, Net redemptions		$ 75,000	$ 100,000
Redeemable noncontrolling interest, Reserve holdback		7,500	$ 10,000
Noncontrolling interest, change from purchase or sale of interests	$ 12,000	$ 24,000
Sale of shares to redeemable noncontrolling interest				$ 0	0	$ 23,921	43,040
Redemption of shares from redeemable noncontrolling interest				$ 12,068	400	$ 78,870	92,204
DaVinciRe Holdings Ltd. | High
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				$ 221,387	180,765	$ 221,387	180,765	$ 181,136		$ 222,165		$ 168,960		$ 115,009
Net (loss) income attributable to redeemable noncontrolling interests				$ (8,769)	4,896	$ (5,171)	8,870
Parent company ownership in redeemable noncontrolling interest				31.60%		31.60%		36.50%
Redemption provision, Notice period						30 days
Sale of shares to redeemable noncontrolling interest				$ 9,391	21,298	$ 72,732	78,615	$ 79,500
Redemption of shares from redeemable noncontrolling interest				$ 1,400	$ 14,389	$ 27,310	$ 21,729	$ 21,700

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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Noncontrolling Interest, Change from Purchase or Sale of Interests

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Noncontrolling Interest, Redemption Provision, Notice Period

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Reserve holdback.

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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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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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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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Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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