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Investment Securities (Details 4) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Investment securities    
Cost or amortized cost $ 5,327.8 $ 6,228.2
Gross unrealized gains 108.6 119.1
Gross unrealized losses (9.8) (18.6)
Net foreign currency gains (losses) (15.3) 5.0
Total fixed maturity investments including assets held for sale   6,333.7
Fixed maturity investments reclassified to assets held for sale   (111.8)
Fixed maturity investments, at fair value 5,411.3 6,221.9
Carrying value, common equity securities 868.7 755.0
Carrying value, convertible fixed securities 152.8 143.8
Carrying value, other long-term investments 306.7 301.3
AutoOne
    
Investment securities    
Fixed maturity investments reclassified to assets held for sale   (111.8)
U.S. Government and agency obligations
    
Investment securities    
Cost or amortized cost 265.1 299.4
Gross unrealized gains 1.8 5.3
Gross unrealized losses   (0.1)
Net foreign currency gains (losses)   0.4
Fixed maturity investments, at fair value 266.9 305.0
Debt securities issued by corporations
    
Investment securities    
Cost or amortized cost 2,269.8 2,072.1
Gross unrealized gains 79.5 73.7
Gross unrealized losses (4.5) (7.8)
Net foreign currency gains (losses) (12.4) (2.9)
Fixed maturity investments, at fair value 2,332.4 2,135.1
Municipal obligations
    
Investment securities    
Cost or amortized cost 2.7 2.7
Fixed maturity investments, at fair value 2.7 2.7
Mortgage-backed and asset-backed securities
    
Investment securities    
Cost or amortized cost 2,138.4 3,190.5
Gross unrealized gains 15.3 25.9
Gross unrealized losses (3.5) (3.9)
Net foreign currency gains (losses) 1.0 10.4
Fixed maturity investments, at fair value 2,151.2 3,222.9
Foreign government, agency and provincial obligations
    
Investment securities    
Cost or amortized cost 569.4 581.2
Gross unrealized gains 7.5 11.0
Gross unrealized losses (1.5) (0.1)
Net foreign currency gains (losses) (3.8) (2.9)
Fixed maturity investments, at fair value 571.6 589.2
Non-cumulative perpetual preference shares
    
Investment securities    
Cost or amortized cost 82.4 82.3
Gross unrealized gains 4.5 3.2
Gross unrealized losses (0.3) (6.7)
Net foreign currency gains (losses) (0.1)  
Fixed maturity investments, at fair value 86.5 78.8
Common shareholders' equity.
    
Investment securities    
Cost or amortized cost 773.0 691.7
Gross unrealized gains 108.6 72.0
Gross unrealized losses (12.9) (8.7)
Convertible fixed maturity investments
    
Investment securities    
Cost or amortized cost 143.4 139.2
Gross unrealized gains 9.8 6.2
Gross unrealized losses (0.4) (1.6)
Other long-term investments.
    
Investment securities    
Cost or amortized cost 275.3 274.4
Gross unrealized gains 58.6 55.5
Gross unrealized losses (20.5) (25.2)
Net foreign currency gains (losses) $ (6.7) $ (3.4)