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Commitments and Contingent Liabilities (Narrative Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Commitments And Contingent Liabilities [Line Items]    
Undrawn outstanding letters of credit in favor of third parties $ 60,300,000 $ 45,400,000
Undrawn outstanding letters of credit between subsidiaries 864,500,000 763,500,000
Syndicated revolving credit facility capacity 850,000,000  
Insurance Treaty Guarantee [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 701,000,000 686,000,000
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 481,700,000 463,500,000
Guarantee Of Borrowed Securities [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Guarantee Obligations Current Carrying Value 87,500,000  
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 166,800,000 176,700,000
Commercial Mortgage Loans [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments 22,200,000 22,200,000
Private Placement Investments [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments 0 0
Bank Loans [Member]
    
Commitments And Contingent Liabilities [Line Items]    
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments $ 80,500,000 $ 68,500,000