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Derivative Instruments (Narrative) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Derivative Instruments [Abstract]          
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Net Investment In Foreign Operations Hedges $ 100,000   $ 100,000   $ 4,100,000
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives 82,100,000 28,500,000 (11,300,000) 2,600,000  
Maximum Potential Future Exposure on Credit Risk Derivatives 619,000,000   619,000,000   614,000,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 900,000   900,000    
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk 6,300,000 (400,000) (57,200,000) (24,300,000)  
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk $ 14,600,000   $ 51,600,000