Summary of Significant Accounting Policies (Details 9) (Symetra, USD $)	12 Months Ended
	Dec. 31, 2011 Y
Symetra
Investments in unconsolidated affiliates
Risk free interest rate (as a percent)	0.31%
Volatility rate (as a percent)	36.00%
Expected life (in years)	2.58
Strike price (in dollars per share)	$ 11.49
Share price (in dollars per share)	$ 9.07