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Derivative Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Derivative Instruments [Abstract]          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 0.7   $ 0.7    
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges 18.4   18.4   (16.4)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives 52.4 82.1 (112.8) (11.3)  
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk (0.4) 6.3 (2.1) (57.2)  
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk $ (0.2) $ 14.6 $ (4.9) $ 51.6