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Investment Securities (Details 6) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Investment Securities  
Fair value, investment-related liabilities$ 66.1$ 77.8
Fixed maturity investments | Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments216.9128.4
Fixed maturity investments | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments5,390.65,786.1
Fixed maturity investments | Fair value measured on a recurring basis | Level 1 Inputs
  
Investment securities  
Fair value investments413.7477.8
Fixed maturity investments | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments4,760.05,179.9
Short-term investments | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments772.8975.3
Short-term investments | Fair value measured on a recurring basis | Level 1 Inputs
  
Investment securities  
Fair value investments759.0878.7
Short-term investments | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments13.896.6
U.S. Government and agency obligations | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments353.1398.7
U.S. Government and agency obligations | Fair value measured on a recurring basis | Level 1 Inputs
  
Investment securities  
Fair value investments343.5388.9
U.S. Government and agency obligations | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments9.69.8
Common Equity Securities | Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments32.171.2
Common Equity Securities | Level 3 Inputs | Fair value measured on a recurring basis | Financials
  
Investment securities  
Fair value investments31.767.8
Common Equity Securities | Level 3 Inputs | Fair value measured on a recurring basis | Utilities
  
Investment securities  
Fair value investments 3.0
Common Equity Securities | Level 3 Inputs | Fair value measured on a recurring basis | Other:
  
Investment securities  
Fair value investments0.40.4
Common Equity Securities | Fair value measured on a recurring basis | Consumer | Fair Value
  
Investment securities  
Fair value investments166.0123.3
Common Equity Securities | Fair value measured on a recurring basis | Consumer | Level 1 Inputs
  
Investment securities  
Fair value investments164.8122.5
Common Equity Securities | Fair value measured on a recurring basis | Consumer | Level 2 Inputs
  
Investment securities  
Fair value investments1.20.8
Common Equity Securities | Fair value measured on a recurring basis | Financials | Fair Value
  
Investment securities  
Fair value investments191.6221.6
Common Equity Securities | Fair value measured on a recurring basis | Financials | Level 1 Inputs
  
Investment securities  
Fair value investments159.4152.6
Common Equity Securities | Fair value measured on a recurring basis | Financials | Level 2 Inputs
  
Investment securities  
Fair value investments0.51.2
Common Equity Securities | Fair value measured on a recurring basis | Energy | Fair Value
  
Investment securities  
Fair value investments57.560.2
Common Equity Securities | Fair value measured on a recurring basis | Energy | Level 1 Inputs
  
Investment securities  
Fair value investments57.560.2
Common Equity Securities | Fair value measured on a recurring basis | Basic materials | Fair Value
  
Investment securities  
Fair value investments108.498.8
Common Equity Securities | Fair value measured on a recurring basis | Basic materials | Level 1 Inputs
  
Investment securities  
Fair value investments107.297.1
Common Equity Securities | Fair value measured on a recurring basis | Basic materials | Level 2 Inputs
  
Investment securities  
Fair value investments1.21.7
Common Equity Securities | Fair value measured on a recurring basis | Utilities | Fair Value
  
Investment securities  
Fair value investments40.747.6
Common Equity Securities | Fair value measured on a recurring basis | Utilities | Level 1 Inputs
  
Investment securities  
Fair value investments40.744.6
Common Equity Securities | Fair value measured on a recurring basis | Technology | Fair Value
  
Investment securities  
Fair value investments28.631.8
Common Equity Securities | Fair value measured on a recurring basis | Technology | Level 1 Inputs
  
Investment securities  
Fair value investments27.630.4
Common Equity Securities | Fair value measured on a recurring basis | Technology | Level 2 Inputs
  
Investment securities  
Fair value investments1.01.4
Common Equity Securities | Fair value measured on a recurring basis | Other: | Fair Value
  
Investment securities  
Fair value investments77.083.7
Common Equity Securities | Fair value measured on a recurring basis | Other: | Level 1 Inputs
  
Investment securities  
Fair value investments25.330.5
Common Equity Securities | Fair value measured on a recurring basis | Other: | Level 2 Inputs
  
Investment securities  
Fair value investments51.352.8
Common Equity Securities | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments669.8667.0
Common Equity Securities | Fair value measured on a recurring basis | Level 1 Inputs
  
Investment securities  
Fair value investments582.5537.9
Common Equity Securities | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments55.257.9
Debt securities issued by corporations | Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments25.5 
Debt securities issued by corporations | Level 3 Inputs | Fair value measured on a recurring basis | Financials
  
Investment securities  
Fair value investments25.5 
Debt securities issued by corporations | Fair value measured on a recurring basis | Consumer | Fair Value
  
Investment securities  
Fair value investments719.0769.0
Debt securities issued by corporations | Fair value measured on a recurring basis | Consumer | Level 2 Inputs
  
Investment securities  
Fair value investments719.0769.0
Debt securities issued by corporations | Fair value measured on a recurring basis | Industrial | Fair Value
  
Investment securities  
Fair value investments425.3511.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Industrial | Level 2 Inputs
  
Investment securities  
Fair value investments425.3511.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Financials | Fair Value
  
Investment securities  
Fair value investments243.4265.8
Debt securities issued by corporations | Fair value measured on a recurring basis | Financials | Level 1 Inputs
  
Investment securities  
Fair value investments5.76.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Financials | Level 2 Inputs
  
Investment securities  
Fair value investments212.2259.5
Debt securities issued by corporations | Fair value measured on a recurring basis | Communications | Fair Value
  
Investment securities  
Fair value investments211.0226.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Communications | Level 2 Inputs
  
Investment securities  
Fair value investments211.0226.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Energy | Fair Value
  
Investment securities  
Fair value investments118.0151.5
Debt securities issued by corporations | Fair value measured on a recurring basis | Energy | Level 2 Inputs
  
Investment securities  
Fair value investments118.0151.5
Debt securities issued by corporations | Fair value measured on a recurring basis | Basic materials | Fair Value
  
Investment securities  
Fair value investments160.1125.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Basic materials | Level 2 Inputs
  
Investment securities  
Fair value investments160.1125.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Utilities | Fair Value
  
Investment securities  
Fair value investments148.3106.7
Debt securities issued by corporations | Fair value measured on a recurring basis | Utilities | Level 2 Inputs
  
Investment securities  
Fair value investments148.3106.7
Debt securities issued by corporations | Fair value measured on a recurring basis | Technology | Fair Value
  
Investment securities  
Fair value investments25.322.1
Debt securities issued by corporations | Fair value measured on a recurring basis | Technology | Level 2 Inputs
  
Investment securities  
Fair value investments25.322.1
Debt securities issued by corporations | Fair value measured on a recurring basis | Diversified | Fair Value
  
Investment securities  
Fair value investments3.5 
Debt securities issued by corporations | Fair value measured on a recurring basis | Diversified | Level 2 Inputs
  
Investment securities  
Fair value investments3.5 
Debt securities issued by corporations | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments2,053.92,178.0
Debt securities issued by corporations | Fair value measured on a recurring basis | Level 1 Inputs
  
Investment securities  
Fair value investments5.76.3
Debt securities issued by corporations | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments2,022.72,171.7
Convertible fixed maturity investments | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments140.5143.0
Convertible fixed maturity investments | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments140.5143.0
Municipal obligations | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments2.43.3
Municipal obligations | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments2.43.3
Mortgage-backed and asset-backed securities | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments2,240.62,071.7
Mortgage-backed and asset-backed securities | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments2,108.72,014.7
Mortgage-backed and asset-backed securities | Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments131.957.0
Other long-term investments. | Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments292.2330.2
Carrying value of investment accounted for using the equity method36.641.9
Other long-term investments. | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments292.2330.2
Non-cumulative perpetual preference shares | Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments59.571.4
Non-cumulative perpetual preference shares | Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments74.687.9
Non-cumulative perpetual preference shares | Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments15.116.5
Level 3 Inputs | Fair value measured on a recurring basis
  
Investment securities  
Fair value investments541.2529.8
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations. | Fair Value
  
Investment securities  
Fair value investments666.01,046.5
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations. | Level 1 Inputs
  
Investment securities  
Fair value investments64.582.6
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations. | Level 2 Inputs
  
Investment securities  
Fair value investments601.5963.9
Fair value measured on a recurring basis | Fair Value
  
Investment securities  
Fair value investments7,265.97,901.6
Fair value measured on a recurring basis | Level 1 Inputs
  
Investment securities  
Fair value investments1,755.21,894.4
Fair value measured on a recurring basis | Level 2 Inputs
  
Investment securities  
Fair value investments4,969.55,477.4
Fixed maturity investments | Level 3 Inputs
  
Investment securities  
Fair value investments216.9128.4
Debt securities issued by corporations
  
Investment securities  
Fair value investments2,053.92,178.0
Mortgage-backed and asset-backed securities | Fair Value
  
Investment securities  
Fair value investments2,240.62,071.7
Mortgage-backed and asset-backed securities | Level 3 Inputs
  
Investment securities  
Fair value investments131.957.0
Mortgage-backed and asset-backed securities | Level 2 Inputs
  
Investment securities  
Fair value investments2,108.72,014.7
Common Equity Securities | Level 3 Inputs
  
Investment securities  
Fair value investments32.171.2
Other long-term investments. | Level 3 Inputs
  
Investment securities  
Fair value investments292.2330.2
Carrying value of investment accounted for using the equity method36.641.9
Fair Value
  
Investment securities  
Fair value investments7,265.97,901.6
Level 1 Inputs
  
Investment securities  
Fair value investments1,755.21,894.4
Level 2 Inputs
  
Investment securities  
Fair value investments$ 4,969.5$ 5,477.4