11. Separate Accounts Death Benefits, Other Insurance Benefit Features and Embedded Product Derivatives (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Variable Annuity GMDB
Liability balance, beginning of the period	$ 16.4	$ 17.7
Incurred	(0.4)	0.8
Paid	(1.0)	(2.1)
Assumption unlocking
Liability balance, end of the period	15.0	16.4
Variable Annuity GMIB
Liability balance, beginning of the period	17.8	18.1
Incurred	3.8	(0.7)
Paid
Assumption unlocking	(0.2)	0.4
Liability balance, end of the period	21.4	17.8
Fixed Indexed Annuity GMWB & GMDB
Liability balance, beginning of the period	5.6	0.5
Incurred	32.3	5.1
Paid
Liability balance, end of the period	37.9	5.6
Universal Life GMWB And GMDB [Member]
Liability balance, beginning of the period	115.9	104.5
Incurred	15.0	34.6
Paid	(7.2)	(6.2)
Assumption unlocking		(17.0)
Liability balance, end of the period	$ 123.7	$ 115.9