Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Activity in redeemable noncontrolling interest
Beginning balance			$ 3,554,053,000
Net income (loss) attributable to redeemable noncontrolling interest	$ 49,331,000	$ 113,544,000	37,419,000	$ 66,694,000
Ending balance	4,352,797,000		4,352,797,000
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,775,503,000	1,555,714,000	1,499,451,000	1,560,693,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments	(74,141,000)	2,676,000	(161,569,000)	(153,295,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments			500,000,000	250,000,000
Net income (loss) attributable to redeemable noncontrolling interest	58,822,000	84,266,000	33,499,000	44,332,000
Ending balance	1,762,677,000	1,642,656,000	1,762,677,000	1,642,656,000
DaVinciRe Holdings Ltd. \| Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	2,493,000	0	391,296,000	190,926,000
Medici
Activity in redeemable noncontrolling interest
Beginning balance	941,912,000	737,702,000	856,820,000	717,999,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments	(20,204,000)	(46,000)	(97,112,000)	(7,745,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments	157,739,000	130,675,000	325,026,000	171,520,000
Net income (loss) attributable to redeemable noncontrolling interest	(26,887,000)	11,989,000	(32,174,000)	(1,454,000)
Ending balance	1,052,560,000	880,320,000	1,052,560,000	880,320,000
Vermeer Reinsurance Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,246,480,000	1,116,154,000	1,197,782,000	1,109,627,000
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	0	30,000,000	0
Net income (loss) attributable to redeemable noncontrolling interest	22,937,000	17,289,000	41,635,000	23,816,000
Ending balance	1,269,417,000	1,133,443,000	1,269,417,000	1,133,443,000
Fontana
Activity in redeemable noncontrolling interest
Beginning balance	0	0	0	0
Sale of shares to redeemable noncontrolling interests, net of adjustments	273,684,000	0	273,684,000	0
Net income (loss) attributable to redeemable noncontrolling interest	(5,541,000)	0	(5,541,000)	0
Ending balance	$ 268,143,000	$ 0	$ 268,143,000	$ 0

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

No definition available.

Name:	us-gaap_IncreaseDecreaseInTemporaryEquityRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4569655-111683

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4616395-111683

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_MinorityInterestDecreaseFromRedemptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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 https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

Name:	us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 23
-URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4569655-111683

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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 https://asc.fasb.org/extlink&oid=122040564&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 https://asc.fasb.org/extlink&oid=122040564&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 https://asc.fasb.org/extlink&oid=122040564&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 https://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764

+ Details

Name:	us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=rnr_DaVinciReHoldingsLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=rnr_ThirdPartyInvestorsAndRenaissanceReMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=rnr_RenaissanceReMediciFundLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=rnr_VermeerReinsuranceLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=rnr_FontanaHoldingsLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: