Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) (USD $)	Sep. 30, 2012
Fixed maturity securities [Member] | Discounted cash flow valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 98,000,000
Fixed maturity securities [Member] | Discounted cash flow valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected call date	3.6
Fixed maturity securities [Member] | Discounted cash flow valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected call date	5.6
Fixed maturity securities [Member] | Discounted cash flow valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected call date	4.6
Fixed maturity securities [Member] | Market approach valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	61,000,000
Fixed maturity securities [Member] | Market approach valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	60.00
Fixed maturity securities [Member] | Market approach valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	105.00
Fixed maturity securities [Member] | Market approach valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	101.49
Equity securities [Member] | Market approach valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	33,000,000
Equity securities [Member] | Market approach valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	0.10
Equity securities [Member] | Market approach valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	3,842
Equity securities [Member] | Market approach valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	583.95
Equity securities [Member] | Income approach valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	17,000,000
EBITDA Projection	80,000,000
EBITDA Multiple	1.82
Life settlement contracts [Member] | Discounted cash flow valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 113,000,000
Life settlement contracts [Member] | Discounted cash flow valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality assumption	65.00%
Life settlement contracts [Member] | Discounted cash flow valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality assumption	928.00%
Life settlement contracts [Member] | Discounted cash flow valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality assumption	185.00%
Life settlement contracts [Member] | Discounted cash flow valuation [Member] | Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate risk premium	9.00%