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Investment Securities (The Cost or Amortized Cost, Gross Unrealized Investment Gains and Losses) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Investment securities    
Fixed maturity investments, at fair value $ 4,914.0 $ 5,196.2
Common shareholders' equity.
    
Investment securities    
Cost or amortized cost 881.5 895.2
Trading Securities, Unrealized Holding Gain 233.8 143.4
Trading Securities, Unrealized Holding Loss (3.5) (8.8)
Net foreign currency gains (losses) (1.1) (0.1)
Fixed maturity investments, at fair value 1,110.7 1,029.7
Convertible Debt Securities
    
Investment securities    
Cost or amortized cost 79.7 121.7
Trading Securities, Unrealized Holding Gain 5.8 6.1
Trading Securities, Unrealized Holding Loss (0.6) (0.4)
Net foreign currency gains (losses) (0.1) 0
Fixed maturity investments, at fair value 84.8 127.4
Other long-term investments.
    
Investment securities    
Cost or amortized cost 252.6 257.2
Trading Securities, Unrealized Holding Gain 77.8 65.9
Trading Securities, Unrealized Holding Loss (27.4) (22.8)
Net foreign currency gains (losses) (3.0) (6.1)
Fixed maturity investments, at fair value $ 300.0 $ 294.2