v2.3.0.15

Noncontrolling Interests (Narrative) (Details) (USD $) |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Sep. 30, 2011 Angus Fund [Member] REAL [Member] | Dec. 31, 2010 Angus Fund [Member] REAL [Member] | Sep. 30, 2011 Angus Fund [Member] RRCA [Member] | Dec. 31, 2010 Angus Fund [Member] RRCA [Member] | Dec. 31, 2010 Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] | Dec. 31, 2011 Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] | Sep. 30, 2011 Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] | Jun. 30, 2011 DaVinciRe [Member] | Dec. 31, 2010 DaVinciRe [Member]
Share repurchase requests, limit |  |  |  |  |  |  |  | 25.00% |  |
Parent company ownership in minority interest |  | 1.00% | 1.00% | 24.20% | 24.80% | 41.20% | 44.00% | 42.80% | 42.80% | 44.00%
Book value of shares repurchased |  |  |  |  |  | $ 88,400,000 |  |  |  |
Estimated book value of redeemable noncontrolling interest shares to be repurchased |  |  |  |  |  |  |  | 8,900,000 |  |
Additional capital returned to remaining shareholders |  |  |  |  |  | 86,600,000 |  |  |  |
Returned additional capital |  |  |  |  |  |  |  | 175,000,000 |  |
Additional capital reserve holdback |  |  |  |  |  |  |  | 17,500,000 |  |
Investment in noncontrolling interest |  | 40,000 | 40,000 | 1,000,000 | 1,000,000 |  |  |  |  |
Redeemable noncontrolling interest share issuance parent | 30,000,000 |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest share issuance total | $ 100,000,000 |  |  |  |  |  |  |  |  |

X
- Definition Aggregate return of capital to parent and redeemable noncontrolling interests during the period as a result of a shareholder repurchase requests. + Details
Name: | rnr_AggregateReturnOfCapitalToParentAndRedeemableNoncontrollingInterests
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The estimated book value of share repurchases notices of redeemable noncontrolling interest at the end of the period. + Details
Name: | rnr_EstimatedBookValueForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Investments by parent in an entity which the parent has significant influence and control and is required to be consolidated. + Details
Name: | rnr_InvestmentInNoncontrollingInterestByParent
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reserve holdback. + Details
Name: | rnr_MinorityInterestAdditionalCapitalReserveHoldbackToParentAndRedeemableNoncontrollingInterest
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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. + Details
Name: | rnr_MinorityInterestAggregateShareRepurchaseRequestLimitAsPercentOfCapital
Namespace Prefix: | rnr
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the amount of equity capital contributed by the parent entity. + Details
Name: | rnr_RedeemableNoncontrollingInterestShareIssuanceParent
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the amount of equity capital contributed by noncontrolling interests and the parent entity. + Details
Name: | rnr_RedeemableNoncontrollingInterestShareIssuanceTotal
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow during the period for return of capital to redeemable noncontrolling interests. + Details
Name: | rnr_ReturnOfCapitalToRedeemableNoncontrollingInterest
Namespace Prefix: | rnr
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. + Details
Name: | us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration