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Derivative Financial Instruments (Fair Value Of The Company's Derivative Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivative Assets $ 13.8  
S and P Five Hundred Index Options [Member] | Fixed Maturity Securities-Available-for-Sale [Member]
   
Derivative Assets 13.8 7.2
Index Based Interest Guarantees [Member] | Other Policyholder Funds Member
   
Derivative Liabilities $ 58.6 $ 49.5