12. Derivative Instruments (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011 As restated and amended [Member]	Sep. 30, 2011 As restated and amended [Member]
Interest rate swaps	$ (0.4)	$ 0.5	$ 9.0	$ 10.5
Variance swaps	(1.8)	(6.4)	5.1	3.5
Swaptions		(0.2)	(0.4)	(1.3)
Put options	(8.4)	(14.6)	32.9	24.3
Call options	7.4	7.6	(11.0)	(11.0)
Equity futures	(11.1)	(20.5)	15.6	9.9
Cross currency swaps	0.1	0.2	1.1	(0.2)
Embedded derivatives	7.1	6.9	(50.5)	(42.9)
Total derivative instrument losses recognized in realized investment gains (losses)	$ (7.1)	$ (26.5)	$ 1.8	$ (7.2)