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Investments (Narrative Details) (USD $)
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Available For Sale Securities Amortized Cost [Member]
Dec. 31, 2012
Available For Sale Securities Amortized Cost [Member]
Mar. 31, 2013
Available For Sale Securities Fair Value Disclosure [Member]
Dec. 31, 2012
Available For Sale Securities Fair Value Disclosure [Member]
Mar. 31, 2013
Borrowed Securities [Member]
Dec. 31, 2012
Borrowed Securities [Member]
Mar. 31, 2013
Collateral Fixed Maturity Securities [Member]
Dec. 31, 2012
Collateral Fixed Maturity Securities [Member]
Mar. 31, 2013
Canadian Province Of Ontario Securities [Member]
Dec. 31, 2012
Canadian Province Of Ontario Securities [Member]
Mar. 31, 2013
Canadian Province Of Quebec Securities [Member]
Dec. 31, 2012
Canadian Province Of Quebec Securities [Member]
Investment Narrative [Line Items]                              
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 204,300,000 $ 248,100,000               $ 85,400,000 $ 95,600,000        
Available For Sale Securities Amortized Cost 11,464,082,000   11,333,431,000         87,500,000 87,500,000 25,400,000 16,900,000        
Available For Sale Securities Fair Value Disclosure 12,441,501,000   12,380,071,000         87,500,000 87,500,000 25,800,000 17,000,000 1,357,900,000 1,400,000,000 1,723,900,000 1,785,000,000
Mortgage Loan Percent Of Cash And Invested Assets 7.00%   7.00%                        
Impaired Financing Receivable Interest Income Accrual Method 570,000 234,000                          
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions 667   567                        
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1 46,300,000   61,500,000                        
Other Invested Assets As A Percentage Of Total Investments 3.40%   3.50%                        
Policy Loans Percent Of Total Investments 3.80%   3.90%                        
Funds Withheld At Interest Percent Of Total Investments 17.30%   17.00%                        
SecuritiesSoldUnderAgreementsToRepurchase 343,200,000   342,000,000 284,500,000 290,200,000 309,700,000 305,900,000                
Assets Held In Trust       $ 8,216,300,000 $ 7,549,000,000 $ 8,889,900,000 $ 7,913,800,000                
Funds Held Under Reinsurance Agreements Asset Specific Client 70.20%   69.70%