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Investments (Narrative Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Investment Narrative [Line Items] |  |  |
Proceeds From Sale Of Available For Sale Securities Sold At Loss | $ 828,000,000 | $ 476,600,000 | $ 622,400,000
Mortgage Loan Percent Of Invested Assets | 7.00% | 4.00% |
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest | 16,900,000 | 20,300,000 |
Policy Loans Percent Of Invested Assets | 3.90% | 5.00% |
Funds Withheld At Interest Percent Of Invested Assets | 17.00% | 21.70% |
Other Invested Assets Percent Of Invested Assets | 3.50% | 4.10% |
Funds Held Under Reinsurance Agreements Asset Specific Client | 3,900,000,000 |  |
Funds Withheld At Interest Investment Yield | 6.97% | 6.87% | 7.20%
Other Impairment Losses Limited Partnership | 8,200,000 |  |
Other Impairment Losses Real Estate Held For Investment | 2,100,000 |  |
SecuritiesForReverseRepurchaseAgreements | 342,000,000 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 567 | 940 |
Available For Sale Securities Amortized Cost [Member] [Member] |  |  |
Investment Narrative [Line Items] |  |  |
SecuritiesSoldUnderAgreementsToRepurchase | 290,200,000 |  |
Available For Sale Securities Fair Value Disclosure [Member] [Member] |  |  |
Investment Narrative [Line Items] |  |  |
SecuritiesSoldUnderAgreementsToRepurchase | 305,900,000 |  |
Non-Income Producing Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 54,200,000 | 86,200,000 |
Available-for-sale Securities, Fair Value Disclosure | 58,500,000 | 79,700,000 |
Canadian Province Of Onatio Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 1,400,000,000 | 1,323,100,000 |
Canadian Province Of Quebec Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 1,785,000,000 | 1,681,900,000 |
Asset And Mortgage Backed Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 61,500,000 | 68,600,000 |
Collateral Pledged Fixed Maturity Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 16,900,000 | 29,000,000 |
Available-for-sale Securities, Fair Value Disclosure | 17,000,000 | 32,600,000 |
Collateral Received Fixed Maturity Securities [Member] |  |  |
Investment Narrative [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | $ 95,600,000 | $ 1,000,000 |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph b(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph b(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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