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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jan. 01, 2015	Jul. 01, 2014	Jun. 30, 2014	Jan. 01, 2014
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest			26.30%		26.30%		23.40%	26.30%	23.40%	26.50%	26.50%
Sale of shares to redeemable noncontrolling interest			$ 0	$ 38,854	$ 0	$ 48,576
Redemption of shares from redeemable noncontrolling interest			$ 1,007	857	$ 209,718	220,602
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest, net redemptions	$ 225,000	$ 300,000
Redeemable noncontrolling interest, reserve holdback	$ 22,500	$ 30,000
Proceeds from sale of partial interest in consolidated subsidiary									$ 38,900
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest | Maximum
Redeemable Noncontrolling Interest [Line Items]
Share repurchase requests, limit			25.00%		25.00%
RenaissanceRe Medici Fund Ltd.
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest			45.80%		45.80%		53.20%
Redemption provision, notice period					30 days
Sale of shares to redeemable noncontrolling interest			$ 4,980	0	$ 36,073	57,084	$ 57,300
Redemption of shares from redeemable noncontrolling interest			$ 1,910	$ 1,200	$ 19,017	$ 3,075	$ 3,100

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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Proceeds from Divestiture of Partial Interest in Consolidated Subsidiaries

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

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