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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Deferred gain related to the completion of the Part VII transfer     $ 3,900          
Net reserves for losses and loss adjustment expenses of acquired insurance companies $ 0 $ 0 57,493          
Net losses and loss adjustment expenses 3,426,441 3,371,699 3,367,223          
Adverse (favorable) development on prior years' loss reserves $ (535,307) $ (551,040) (497,627)          
IBNR reserves as a percentage of total unpaid losses and loss adjustment expenses 65.00% 64.00%            
Insurance [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Net losses and loss adjustment expenses $ 2,730,971 $ 2,596,057 2,442,344          
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 14,400,300              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8,724,600              
Insurance [Member] | 2011 and Prior Accident Years [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Adverse (favorable) development on prior years' loss reserves (46,900)              
Insurance [Member] | 2012 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 1,330,500 1,350,700 1,364,100 $ 1,397,800 $ 1,430,200 $ 1,491,600 $ 1,613,200 $ 1,370,800
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 101,300              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,180,100 1,153,200 1,119,800 1,055,000 939,500 781,500 568,600 233,800
Cumulative number of reported claims 128,000              
Insurance [Member] | 2012 Accident Year [Member] | Alterra [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance             256,500  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance             36,800  
Insurance [Member] | 2013 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,329,300 1,372,000 1,418,100 1,464,900 1,528,400 1,698,200 1,738,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 126,700              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,125,100 1,101,300 1,038,900 950,500 780,000 572,100 271,800  
Cumulative number of reported claims 88              
Insurance [Member] | 2013 Accident Year [Member] | Alterra [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance             313,400  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance             29,500  
Insurance [Member] | 2014 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,505,300 1,525,700 1,574,200 1,632,200 1,700,100 1,866,000    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 138,600              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,255,300 1,170,500 1,064,700 896,500 659,200 332,300    
Cumulative number of reported claims 80              
Insurance [Member] | 2015 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,505,400 1,537,300 1,591,700 1,714,200 1,786,600      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 197,100              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,151,900 1,041,900 877,700 666,000 322,800      
Cumulative number of reported claims 85              
Insurance [Member] | 2016 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,716,500 1,770,800 1,872,100 1,875,300        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 297,300              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,169,800 983,700 753,700 372,500        
Cumulative number of reported claims 90              
Insurance [Member] | 2017 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 2,076,200 2,198,900 2,330,800          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 422,400              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,286,700 992,800 438,800          
Cumulative number of reported claims 124              
Insurance [Member] | 2018 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 2,354,800 2,457,300            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 904,000              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,027,800 496,700            
Cumulative number of reported claims 173              
Insurance [Member] | 2019 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance $ 2,582,300              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,639,800              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 527,900              
Cumulative number of reported claims 181              
Reinsurance [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Net losses and loss adjustment expenses $ 695,470 775,642 924,879          
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 4,924,900              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,403,300              
Reinsurance [Member] | 2011 and Prior Accident Years [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Adverse (favorable) development on prior years' loss reserves (43,000)              
Reinsurance [Member] | 2012 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 445,100 448,000 456,200 457,800 486,600 508,700 551,700 73,000
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 42,400              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 309,500 289,500 264,400 232,000 184,300 129,100 64,700 $ 4,100
Reinsurance [Member] | 2012 Accident Year [Member] | Alterra [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance             476,200  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance             52,700  
Reinsurance [Member] | 2013 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 489,400 507,500 544,800 534,700 548,300 580,300 588,000  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 42,700              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 351,000 331,900 301,900 268,900 209,900 155,700 71,300  
Reinsurance [Member] | 2013 Accident Year [Member] | Alterra [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance             537,500  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance             $ 68,700  
Reinsurance [Member] | 2014 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 535,400 559,100 581,200 536,400 564,500 577,400    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 87,700              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 346,000 311,800 274,500 226,400 158,100 $ 98,000    
Reinsurance [Member] | 2015 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 511,900 523,500 532,400 514,000 527,900      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 143,400              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 306,200 258,500 207,200 133,400 $ 63,800      
Reinsurance [Member] | 2016 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 529,300 530,600 532,100 522,100        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 126,600              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 298,300 241,500 170,400 $ 79,700        
Reinsurance [Member] | 2017 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 943,100 938,100 905,300          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 276,100              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 481,500 359,500 158,000          
Reinsurance [Member] | 2018 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 792,500 759,200            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 373,400              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 256,700 87,500            
Reinsurance [Member] | 2019 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 678,200              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 483,100              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 54,100              
Asbestos [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Asbestos-related reserves, gross loss incurred 234,200 247,700            
Asbestos-related reserves, net loss incurred 74,400 83,000            
Gen Liab Workers Comp Marine & Energy And Prof Liab Insurance Segment Property And Whole Account Reinsurance Segment [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Adverse (favorable) development on prior years' loss reserves $ (431,000)              
Gen Liab Workers Comp Prof Liab and Marine And Energy Insurance Segment Credit And Surety And Marine And Energy Reinsurance Segment [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Adverse (favorable) development on prior years' loss reserves   (424,100)            
Gen Liab Prof Liab Workers Comp Marine And Energy Insurance Segment Surety And Marine And Energy Reinsurance Segment [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Adverse (favorable) development on prior years' loss reserves     (422,900)          
Ogden Rate Change [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Adverse (favorable) development on prior years' loss reserves     85,000          
Personal Lines [Member] | Insurance [Member] | 2012 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Cumulative number of reported claims 66              
Personal Lines [Member] | Insurance [Member] | 2013 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Cumulative number of reported claims 17              
Personal Lines [Member] | Insurance [Member] | 2017 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Cumulative number of reported claims 24              
Personal Lines [Member] | Insurance [Member] | 2018 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Cumulative number of reported claims 54              
Personal Lines [Member] | Insurance [Member] | 2019 Accident Year [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Cumulative number of reported claims 78              
2019 Catastrophes [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Net losses and loss adjustment expenses, net of assumed reinstatement premiums $ 100,400              
Net losses and loss adjustment expenses 114,000              
Net assumed reinstatement premiums (13,600)              
Reinsurance recoverables $ 62,500              
2018 Catastrophes [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Net losses and loss adjustment expenses, net of assumed reinstatement premiums   287,300            
Net losses and loss adjustment expenses   292,800            
Net assumed reinstatement premiums   (5,400)            
Reinsurance recoverables   $ 244,100            
2017 Catastrophes [Member]                
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Net losses and loss adjustment expenses, net of assumed reinstatement premiums     565,300          
Net losses and loss adjustment expenses     585,400          
Net assumed reinstatement premiums     (20,100)          
Reinsurance recoverables     $ 490,300