8. Separate Accounts Death Benefits, Other Insurance Benefit Features and Embedded Product Derivatives (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Variable Annuity GMDB	Dec. 31, 2011 Variable Annuity GMDB As restated and amended [Member]	Dec. 31, 2010 Variable Annuity GMDB As restated and amended [Member]	Dec. 31, 2012 Variable Annuity GMIB	Dec. 31, 2011 Variable Annuity GMIB As restated and amended [Member]	Dec. 31, 2010 Variable Annuity GMIB As restated and amended [Member]	Dec. 31, 2012 Fixed Indexed Annuity GMWB & GMDB	Dec. 31, 2011 Fixed Indexed Annuity GMWB & GMDB As restated and amended [Member]	Dec. 31, 2010 Fixed Indexed Annuity GMWB & GMDB As restated and amended [Member]	Dec. 31, 2012 Universal Life Secondary Guarantees [Member]	Dec. 31, 2011 Universal Life Secondary Guarantees [Member] As restated and amended [Member]	Dec. 31, 2010 Universal Life Secondary Guarantees [Member] As restated and amended [Member]
Liability balance, beginning of the period	$ 10.8	$ 11.2	$ 13.2	$ 17.2	$ 17.5	$ 15.8	$ 5.6	$ 0.5		$ 98.2	$ 88.5	$ 65.7
Incurred	1.0	1.5	1.8	3.8	(0.7)	2.3	40.1	5.1	0.5	22.6	16.0	43.2
Paid	(1.0)	(1.9)	(3.8)							(9.5)	(6.3)	(20.4)
Assumption unlocking				(0.2)	0.4	(0.6)
Liability balance, end of the period	$ 10.8	$ 10.8	$ 11.2	$ 20.8	$ 17.2	$ 17.5	$ 45.7	$ 5.6	$ 0.5	$ 111.3	$ 98.2	$ 88.5