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Investment Securities (The Cost or Amortized Cost, Gross Unrealized Investment Gains and Losses) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investment securities    
Common equity securities, at fair value $ 1,073.2 $ 1,029.7
Convertible fixed maturity investments, at fair value 95.6 127.4
Other long-term investments 295.2 294.2
Common shareholders' equity.
    
Investment securities    
Cost or amortized cost 876.8 895.2
Gross unrealized gains 201.7 143.4
Trading Securities, Gross Unrealized Loss 5.2 8.8
Net foreign currency gains (losses) (0.1) (0.1)
Common equity securities, at fair value 1,073.2 1,029.7
Convertible Debt Securities
    
Investment securities    
Cost or amortized cost 91.2 121.7
Gross unrealized gains 5.9 6.1
Trading Securities, Gross Unrealized Loss 1.3 0.4
Net foreign currency gains (losses) (0.2) 0
Convertible fixed maturity investments, at fair value 95.6 127.4
Other long-term investments.
    
Investment securities    
Cost or amortized cost 254.5 257.2
Gross unrealized gains 57.0 65.9
Trading Securities, Gross Unrealized Loss 10.3 22.8
Net foreign currency gains (losses) (6.0) (6.1)
Other long-term investments $ 295.2 $ 294.2