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Investment Securities (Cost and Amortized Cost Maturity Schedule) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Including Short Term Fixed
Dec. 31, 2012
Fixed Maturities and Convertible Fixed Maturities Excluding A B S M B S and Preferred Stock
Dec. 31, 2012
Mortgage-backed and asset-backed securities
Dec. 31, 2011
Mortgage-backed and asset-backed securities
Dec. 31, 2012
Preferred stocks
Dec. 31, 2011
Preferred stocks
Dec. 31, 2012
Excluding Short Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]                
Duration of Fixed Maturities including short-term investments in years   2 years 4 months 24 days           2 years 8 months 12 days
Trading Securities by Maturity Cost or Amortized Cost                
Due in one year or less     $ 395.9          
Due after one year through five years     2,297.8          
Due after five years through ten years     648.9          
Due after ten years     72.8          
Trading Securities, Maturities without Single Maturity Date, Amortized Cost       2,081.0   79.9    
Cost or amortized cost 5,576.3     2,081.0 3,190.5 79.9 82.3  
Trading Securities by Maturity, Fair Value                
Due in one year or less     396.7          
Due after one year through five years     2,336.7          
Due after five years through ten years     671.6          
Due after ten years     74.7          
Trading Securities, Maturities without Single Maturity Date, Carrying Value       2,095.6   86.4    
Trading Securities $ 5,661.7