v2.3.0.15

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Fixed maturity investments trading, Amortized cost	$ 3,671,728	$ 3,859,442
Fixed maturity investments available for sale, Amortized cost	139,283	225,549
Equity investments trading, Cost	$ 47,996

X

- Definition

This item represents the total of all debt securities classified as trading, at cost, net of adjustments made for accretion, amortization and collection of cash, if any.

+ Details

Name:	rnr_AmortizedCostOfFixedMaturitiesTrading
Namespace Prefix:	rnr
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This item represents a parenthetical disclosure for the cost of securities classified as trading.

+ Details

Name:	us-gaap_TradingSecuritiesCost
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant