v2.4.0.6
Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) (USD $)
3 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
DaVinciRe [Member]
Mar. 31, 2012
DaVinciRe [Member]
Jan. 02, 2013
DaVinciRe [Member]
Dec. 31, 2012
DaVinciRe [Member]
Oct. 02, 2012
DaVinciRe [Member]
Jun. 01, 2012
DaVinciRe [Member]
Jan. 02, 2012
DaVinciRe [Member]
Dec. 31, 2011
DaVinciRe [Member]
Jan. 02, 2012
DaVinciRe [Member]
Retroactive Adjustment [Member]
Oct. 02, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest [Member]
Jun. 01, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest [Member]
Jan. 02, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest [Member]
Jan. 31, 2013
DaVinciRe [Member]
Redeemable Noncontrolling Interest [Member]
Dec. 31, 2012
DaVinciRe [Member]
Redeemable Noncontrolling Interest [Member]
Notice Submitted in Advance of Deadline [Member]
Mar. 31, 2013
DaVinciRe [Member]
Redeemable Noncontrolling Interest [Member]
Maximum [Member]
Jan. 02, 2012
Variable Interest Entity, Primary Beneficiary [Member]
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]                                    
Parent company ownership in redeemable noncontrolling interest     32.90%   32.90% 30.80% 30.80%   34.70% 42.80% 31.50%              
Share repurchase requests, limit                                 25.00%  
Redeemable noncontrolling interest, reserve holdback               $ 5,000,000           $ 4,900,000 $ 20,500,000     $ 10,000,000
Proceeds from sale of partial interest in consolidated subsidiary                       9,800,000   98,900,000        
Redeemable noncontrolling interest, net redemptions                             150,000,000      
Sale of parent equity to third party                         24,700,000          
Proceeds from equity raised                         49,400,000          
Activity in redeemable noncontrolling interest                                    
Balance, Beginning 875,770,000 968,259,000 968,259,000 657,727,000                       53,200,000    
Purchase of shares from redeemable noncontrolling interests     (186,231,000) 0                            
Sale of shares to redeemable noncontrolling interest     54,927,000 85,668,000                 49,300,000          
Net income (loss) attributable to redeemable noncontrolling interest     38,815,000 53,348,000                            
Balance, Ending $ 875,770,000 $ 968,259,000 $ 875,770,000 $ 796,743,000                       $ 53,200,000