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Derivative Instruments (Narrative Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Derivative Instruments [Abstract] |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 1,000,000 |  |
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Net Investment In Foreign Operations Hedges | (16,400,000) | 4,100,000 |
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (61,400,000) | 188,600,000 | 29,900,000
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk | (62,700,000) | 23,100,000 | (32,200,000)
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk | $ 16,500,000 |  |

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- Definition Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) related to hedges of net investments in foreign operations. + References No definition available. + Details
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- Details
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- Definition The effect on the statement of income reflected in investment related gains (losses) associated with using the Company's own credit risk in the calculation of the fair value of the embedded derivatives. + References No definition available. + Details
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- Definition The effect on the statement of income reflected in investment related gains (losses) associated with using the Company's own credit risk in the calculation of the fair value of the embedded derivatives on variable annuity contracts. + References No definition available. + Details
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- Definition This item represents the amount recognized in investment related gains (losses) related to the change in the fair value of derivatives, excluding embedded derivatives. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(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 Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 + Details
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