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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 |  |  |  |  |  |  |  |  |  |

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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 The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 49 -IssueDate 2006-05-01 -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 860 -SubTopic 10 -Section 05 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6901665&loc=d3e93645-111703 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6862952&loc=d3e113969-111729 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 15 -Subparagraph a, b, c, d -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 91 -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. + Details
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