Noncontrolling Interests (Schedule of Redeemable Noncontrolling Interest) (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Activity in redeemable noncontrolling interest
Beginning balance	$ 3,554,053,000
Net income (loss) attributable to redeemable noncontrolling interest	(11,912,000)	$ (46,850,000)
Ending balance	3,963,895,000
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,499,451,000	1,560,693,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments	(87,428,000)	(155,971,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments	500,000,000	250,000,000
Net income (loss) attributable to redeemable noncontrolling interest	(25,323,000)	(39,934,000)
Ending balance	1,775,503,000	1,555,714,000
DaVinciRe Holdings Ltd. \| Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	388,803,000	190,926,000
Medici
Activity in redeemable noncontrolling interest
Beginning balance	856,820,000	717,999,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments	(76,908,000)	(7,699,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments	167,287,000	40,845,000
Net income (loss) attributable to redeemable noncontrolling interest	(5,287,000)	(13,443,000)
Ending balance	941,912,000	737,702,000
Vermeer Reinsurance Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,197,782,000	1,109,627,000
Sale of shares to redeemable noncontrolling interests, net of adjustments	30,000,000	0
Net income (loss) attributable to redeemable noncontrolling interest	18,698,000	6,527,000
Ending balance	$ 1,246,480,000	$ 1,116,154,000

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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