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Derivative Instruments (Narrative) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 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 $ (19,400,000)   $ (19,400,000)   $ 4,100,000
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives (20,600,000) 200,800,000 (31,800,000) 203,400,000  
Maximum Potential Future Exposure on Credit Risk Derivatives 622,500,000   622,500,000   614,000,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 800,000   800,000    
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk (6,200,000) 25,400,000 (63,400,000) 1,100,000  
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk $ (28,300,000)   $ 23,200,000