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Investments Investments (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 position | Dec. 31, 2012 position | Dec. 31, 2011
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 11,697,394,000 | $ 11,333,431,000 |
Available-for-sale Securities, Fair Value Disclosure | 12,110,755,000 | 12,380,071,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1,396 | 567 |
Proceeds From Sale Of Available For Sale Securities Sold At Loss | 1,104,000,000 | 828,000,000 | 476,600,000
Available-for-sale Securities, Gross Realized Losses | 60,575,000 | 27,474,000 | 26,996,000
Securities For Reverse Repurchase Agreements | 344,200,000 | 342,000,000 |
Mortgage Loan Percent Of Invested Assets | 7.70% | 7.00% |
Policy Loans Percent Of Invested Assets | 3.80% | 3.90% |
Funds Withheld At Interest Percent Of Invested Assets | 17.80% | 17.00% |
Percentage Of Total Gross Unrealized Losses | 100.00% | 100.00% |
Funds withheld at interest | 5,771,467,000 | 5,594,182,000 |
Funds Held Under Reinsurance Agreements Asset Specific Client | 4,100,000,000 |  |
Funds Withheld At Interest Investment Yield | 9.68% | 6.97% | 6.87%
Other Invested Assets Percent Of Invested Assets | 4.10% | 3.50% |
Non-Income Producing Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 38,500,000 | 54,200,000 |
Available-for-sale Securities, Fair Value Disclosure | 47,600,000 | 58,500,000 |
Canadian Province Of Onatio Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 1,222,300,000 | 1,400,000,000 |
Canadian Province Of Quebec Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 1,389,100,000 | 1,785,000,000 |
Collateral Pledged Fixed Maturity Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 57,200,000 | 16,900,000 |
Available-for-sale Securities, Fair Value Disclosure | 58,000,000 | 17,000,000 |
Collateral Received Fixed Maturity Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 94,100,000 | 95,600,000 |
Available For Sale Securities Amortized Cost [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Securities Borrowed | 93,000,000 | 87,500,000 |
Amortized Cost (Member) |  |  |
Investment Narrative [Line Items] |  |  |
Securities Sold Under Agreements To Repurchase | 300,300,000 | 290,200,000 |
Transfer to Investments | 5,406,898,000 |  |
Estimate of Fair Value Measurement [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Securities Sold Under Agreements To Repurchase | 310,800,000 | 305,900,000 |
Transfer to Investments | 5,457,290,000 |  |
Mortgage Receivable [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | $ 0 | $ 16,886,000 |

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