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Investments (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
securities
Jun. 30, 2012
Jun. 30, 2013
securities
Jun. 30, 2012
Dec. 31, 2012
securities
Jun. 30, 2013
Collateral Fixed Maturity Securities
Dec. 31, 2012
Collateral Fixed Maturity Securities
Jun. 30, 2013
Canadian Province Of Ontario Securities
Dec. 31, 2012
Canadian Province Of Ontario Securities
Jun. 30, 2013
Canadian Province Of Quebec Securities
Dec. 31, 2012
Canadian Province Of Quebec Securities
Jun. 30, 2013
Available For Sale Securities Amortized Cost [Member]
Dec. 31, 2012
Available For Sale Securities Amortized Cost [Member]
Jun. 30, 2013
Available For Sale Securities Fair Value Disclosure [Member]
Dec. 31, 2012
Available For Sale Securities Fair Value Disclosure [Member]
Jun. 30, 2013
Investment in mortgage loans
Dec. 31, 2012
Investment in mortgage loans
Jun. 30, 2013
Asset-backed and mortgage-backed securities
Non-investment grade securities
Dec. 31, 2012
Asset-backed and mortgage-backed securities
Non-investment grade securities
Investment Narrative [Line Items]                                      
Available-for-sale Securities, Amortized Cost Basis $ 11,346,144,000   $ 11,346,144,000   $ 11,333,431,000 $ 32,900,000 $ 16,900,000                        
Securities held in trust                       8,046,900,000 7,549,000,000 8,377,600,000 7,913,800,000        
Proceeds From Sale Of Available For Sale Securities Sold At Loss 257,600,000 153,500,000 461,900,000 401,600,000   91,500,000 95,600,000                        
Available-for-sale Securities 11,803,481,000   11,803,481,000   12,380,071,000 33,900,000 17,000,000 1,231,600,000 1,400,000,000 1,516,300,000 1,785,000,000                
Securities as a percentage of consolidated stockholder equity 10.00%   10.00%   10.00%                            
Number of fixed maturity and equity securities in an unrealized loss position 1,394   1,394   567                            
Gross Unrealized Losses - 12 months or greater                                   29,200,000 61,500,000
Net other-than-temporary impairment losses on fixed maturities recognized in earnings (10,109,000) (1,797,000) (10,311,000) (16,625,000)                              
Realized losses on fixed maturity and equity securities sold (6,760,000) (8,918,000) (17,972,000) (16,422,000)                              
Minimum percentage of fair value     100.00%                                
Securities Borrowed                       87,500,000 87,500,000 87,500,000 87,500,000        
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements     100.00%                                
Securities pledged or received 292,100,000   292,100,000   290,200,000                            
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 307,700,000   307,700,000   305,900,000                            
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 338,000,000   338,000,000   342,000,000                            
Mortgage loans percentage of total investments 7.50%   7.50%   7.00%                            
Maximum loan to value ratio on mortgage loan approval     75.00%                                
Mortgage loans on nonaccrual status                               $ 7,930,000 $ 16,886,000    
Policy loans, percentage of total investments 3.90%   3.90%   3.90%                            
Funds withheld at interest, percentage of total investments 18.20%   18.20%   17.00%                            
Funds withheld at interest, percentage attibutable to one client 70.80%   70.80%   69.70%                            
Other invested assets, percentage of total investments 3.30%   3.30%   3.50%