v2.3.0.15

Derivative Instruments (Gross Derivative Contract Positions Outstanding Relating To Energy And Weather Derivatives Trading Activities) (Details) | Sep. 30, 2011 Btu bushels | Dec. 31, 2010 bushels Btu
--- | --- | ---
Derivative Instruments |  |  |  |
Energy | 170,550,283 | [1] | 136,767,119 | [1]
Temperature | 12,896,109 | [1] | 5,419,846 | [1]
Agriculture | 12,008,000 | [1] | 260,000 | [1]
[1] | Represents the sum of gross long and gross short derivative contracts.

X
- Definition The quantity of agriculture derivative contracts represented as the sum of gross long and gross short contract positions. + Details
Name: | rnr_SumOfGrossLongAndShortAgricultureDerivativeContracts
Namespace Prefix: | rnr
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The quantity of energy derivative contracts represented as the sum of gross long and gross short contract positions. + Details
Name: | rnr_SumOfGrossLongAndShortEnergyDerivativeContracts
Namespace Prefix: | rnr
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition The quantity of temperature derivative contracts represented as the sum of gross long and gross short contract positions. + Details
Name: | rnr_SumOfGrossLongAndShortTemperatureDerivativeContracts
Namespace Prefix: | rnr
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SummaryOfDerivativeInstrumentsAbstract
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration