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Investments (Narrative) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Borrowed Securities [Member]
Dec. 31, 2011
Borrowed Securities [Member]
Sep. 30, 2012
Collateral Fixed Maturity Securities [Member]
Dec. 31, 2011
Collateral Fixed Maturity Securities [Member]
Sep. 30, 2012
Canadian Province Of Ontario Securities [Member]
Dec. 31, 2011
Canadian Province Of Ontario Securities [Member]
Sep. 30, 2012
Canadian Province Of Quebec Securities [Member]
Dec. 31, 2011
Canadian Province Of Quebec Securities [Member]
Sep. 30, 2012
Investment Grade Securities [Member]
Dec. 31, 2011
Investment Grade Securities [Member]
Investment Narrative [Line Items]                              
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 220,500,000 $ 57,200,000 $ 622,100,000 $ 388,900,000       $ 95,300,000 $ 1,000,000            
Available For Sale Securities Amortized Cost 10,885,071,000   10,885,071,000   6,931,958,000 237,500,000 150,000,000 32,000,000 29,000,000            
Available For Sale Securities Fair Value Disclosure 11,899,722,000   11,899,722,000   7,461,106,000 237,500,000 150,000,000 37,200,000 32,600,000 1,261,000,000 1,171,200,000 1,187,000,000 1,107,700,000    
Percentage Of Total Gross Unrealized Losses                           52.80% 65.30%
Mortgage Loan Percent Of Cash And Invested Assets 6.70%   6.70%   3.80%                    
Impaired Financing Receivable Interest Income Accrual Method 570,000 234,000 1,485,000 780,000                      
Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest 16,300,000   16,300,000   20,300,000                    
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions 618   618   940                    
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1 61,400,000   61,400,000   68,600,000                    
Other Invested Assets Percent Of Cash And Invested Assets 3.70%   3.70%   3.90%                    
Other Impairment Losses Limited Partnership     7,500,000                        
Securities Received as Collateral $ 95,300,000   $ 95,300,000   $ 1,000,000