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Investment Securities (Cost or Amortized Cost, Gross Unrealized Investment Gains and Losses) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2010
Investment securities      
Cost or amortized cost   $ 5,576.3  
Common equity securities, at fair value 755.0 1,029.7  
Convertible fixed maturity investments, at fair value 143.8 127.4  
Other long-term investments 301.3 294.2  
Proceeds from sale of maturities 5,034.0 6,997.5 4,492.6
Common shareholders’ equity
      
Investment securities      
Cost or amortized cost 691.7 895.2  
Gross unrealized gains 72.0 143.4  
Gross unrealized losses (8.7) (8.8)  
Net foreign currency losses 0 (0.1)  
Common equity securities, at fair value 755.0 1,029.7  
Convertible fixed maturity investments
      
Investment securities      
Cost or amortized cost 139.2 121.7  
Gross unrealized gains 6.2 6.1  
Gross unrealized losses (1.6) (0.4)  
Net foreign currency losses 0 0  
Convertible fixed maturity investments, at fair value 143.8 127.4  
Other long-term investments
      
Investment securities      
Cost or amortized cost 274.4 257.2  
Gross unrealized gains 55.5 65.9  
Gross unrealized losses (25.2) (22.8)  
Net foreign currency losses (3.4) (6.1)  
Other long-term investments $ 301.3 $ 294.2