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 |