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Commitments and Contingent Liabilities (Narrative) (USD $)
Jul. 13, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Insurance Treaty Guarantee [Member]
Dec. 31, 2011
Insurance Treaty Guarantee [Member]
Jun. 30, 2012
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
Dec. 31, 2011
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
Dec. 31, 2011
Guarantee Of Borrowed Securities [Member]
Jun. 30, 2011
Guarantee Of Borrowed Securities [Member]
Jun. 30, 2012
Guarantee Of Subsidiary Collateral Financing [Member]
Jun. 30, 2012
Limited Partnerships [Member]
Dec. 31, 2011
Limited Partnerships [Member]
Jun. 30, 2012
Commercial Mortgage Loans [Member]
Dec. 31, 2011
Commercial Mortgage Loans [Member]
Jun. 30, 2012
Private Placement Investments [Member]
Dec. 31, 2011
Private Placement Investments [Member]
Commitments And Contingent Liabilities [Line Items]                                
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments $ 100,000,000                   $ 186,200,000 $ 156,600,000 $ 49,500,000 $ 33,600,000 $ 106,000,000 $ 100,000,000
Undrawn outstanding letters of credit in favor of third parties   16,000,000 15,800,000                          
Undrawn outstanding letters of credit between subsidiaries   527,700,000 582,900,000                          
Syndicated revolving credit facility capacity   850,000,000                            
Syndicated revolving credit facility undrawn outstanding   263,300,000                            
Other Long Term Credit Facility Capacity 200 Million Dollar   200,000,000                            
Other Long Term Credit Facility Undrawn Outstanding 200 Million Dollar   200,000,000                            
Other Long Term Credit Facility Capacity 120 Million Dollar   120,000,000                            
Other Long Term Credit Facility Undrawn Outstanding 120 Million Dollar   0                            
Guarantee Obligations Current Carrying Value       $ 656,100,000 $ 697,500,000 $ 434,500,000 $ 467,500,000 $ 150,000,000 $ 237,500,000 $ 300,000,000