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Investments Fixed Maturity Securities Stratified by Contractual Maturity (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Due within one year or less, Amortized Cost $ 1,030.0  
Due after one year through five years, Amortized Cost 3,405.9  
Due after five years through ten years, Amortized Cost 3,169.2  
Due after ten years, Amortized Cost 232.5  
Fixed maturitiy securities (amortized costs) 7,837.8 7,884.6
Due in one year or less, Estimated Fair Value 1,046.9  
Due after one year through five years, Estimated Fair Value 3,599.4  
Due after five years through ten years, Estimated Fair Value 3,492.3  
Due after ten years, Estimated Fair Value 248.5  
Available for sale, Fixed maturity securities $ 8,387.1 $ 8,393.2