Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details) (USD $)	Jun. 30, 2012
Fixed maturity securities [Member] | Discounted cash flow valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 122,000,000
Fixed maturity securities [Member] | Discounted cash flow valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected call date	0.3
Spreads off benchmark yields	225
Fixed maturity securities [Member] | Discounted cash flow valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected call date	4.7
Spreads off benchmark yields	325
Fixed maturity securities [Member] | Discounted cash flow valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected call date	3.5
Spreads off benchmark yields	269
Fixed maturity securities [Member] | Market approach valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	34,000,000
Fixed maturity securities [Member] | Market approach valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	97.25
Fixed maturity securities [Member] | Market approach valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	100.08
Fixed maturity securities [Member] | Market approach valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	99.16
Equity securities [Member] | Market approach valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	93,000,000
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	4,023
Equity securities [Member] | Market approach valuation [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Private offering price	268.85
Life settlement contracts [Member] | Discounted cash flow valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 116,000,000
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%