8. Separate Accounts Death Benefits, Other Insurance Benefit Features and Embedded Product Derivatives (Details 3) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 As restated and amended [Member]	Dec. 31, 2012 GMWB	Dec. 31, 2011 GMWB As restated and amended [Member]	Dec. 31, 2012 GMAB	Dec. 31, 2011 GMAB As restated and amended [Member]	Dec. 31, 2012 COMBO	Dec. 31, 2011 COMBO As restated and amended [Member]
Additional Insurance Benefits	$ 935.2	$ 926.1	$ 547.4	$ 541.9	$ 379.5	$ 374.4	$ 8.3	$ 9.8
Average Attained Age Of Annuitant			63 years	62 years	58 years	57 years	61 years	60 years