10. Fair Value of Financial Instruments (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Embedded Derivative (EIA VED) [Member]	Dec. 31, 2012 Embedded derivatives (EIA VED) [Member]	Dec. 31, 2012 Embedded derivatives (EIA VED) [Member]	Dec. 31, 2012 Embedded derivatives (EIA VED) [Member]	Dec. 31, 2012 Embedded derivatives (GMAB / GMWB) [Member]	Dec. 31, 2012 Embedded derivatives (GMAB / GMWB) [Member]	Dec. 31, 2012 Embedded derivatives (GMAB / GMWB) [Member]	Dec. 31, 2012 Embedded derivatives (GMAB / GMWB) [Member]	Dec. 31, 2012 Embedded derivatives (GMAB / GMWB) [Member]	Dec. 31, 2012 Embedded Derivatives [Member]	Dec. 31, 2011 Embedded Derivatives [Member]
Level 3 Liabilities:
Fair Value, Balance	$ 51.2				$ 28.3					$ 79.5	$ 82.3
Valuation Techniques	Budget method	Budget method	Budget method	Budget method	Risk neutral stochastic valuation methodology	Risk neutral stochastic valuation methodology	Risk neutral stochastic valuation methodology	Risk neutral stochastic valuation methodology	Risk neutral stochastic valuation methodology
Unobservable Input	Swap curve	Mortality rate	Lapse rate	CSA	Volatility surface	Swap curve	Mortality rate	Lapse rate	CSA
Range	0.21% - 2.50%	75% of A2000 basic table	1.00% - 35.00%	4.47%	11.67% - 50.83%	0.36% - 3.17%	75% of A2000 basic table	0.00% - 60.00%	4.47%