8. Investing Activities (Details 8) (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]
Debt securities	$ 193.6	$ 398.2	$ 93.2	$ 252.0
Equity securities	(3.3)	(0.4)	(4.3)	(3.8)
Other investments			(0.1)	(0.1)
Net unrealized investment gains	190.3	397.8	88.8	248.1
Applicable closed block policyholder dividend obligation	84.7	171.5	73.5	155.4
Applicable deferred policy acquisition cost	15.1	66.4	17.1	43.5
Applicable other actuarial offsets	58.9	77.6	13.4	10.4
Applicable deferred income tax expense (benefit)	38.6	83.5	(30.1)	1.1
Offsets to net unrealized investment gains	197.3	399.0	73.9	210.4
Net unrealized investment gains (losses) included in OCI	$ (7.0)	$ (1.2)	$ 14.9	$ 37.7