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Commitments and Contingent Liabilities (Narrative) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments $ 100,000,000  
Undrawn outstanding letters of credit in favor of third parties 19,200,000 15,800,000
Undrawn outstanding letters of credit between subsidiaries 632,900,000 582,900,000
Syndicated revolving credit facility capacity 850,000,000  
Syndicated revolving credit facility undrawn outstanding 271,700,000  
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 100,000,000  
Insurance Treaty Guarantee [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 669,400,000 697,500,000
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 445,700,000 467,500,000
Guarantee Of Borrowed Securities [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 237,500,000 150,000,000
Guarantee Of Subsidiary Collateral Financing [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 300,000,000  
Limited Partnerships [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments 169,700,000 156,600,000
Commercial Mortgage Loans [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments 62,100,000 33,600,000
Private Placement Investments [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments 7,500,000 100,000,000
Bank Loans [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments $ 35,800,000