7. Investing Activities (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 As restated and amended [Member]	Dec. 31, 2010 As restated and amended [Member]
Debt securities	$ 123.0	$ 77.2	$ 101.5
Equity securities		0.1	(0.1)
Other investments	(0.2)	(0.1)	0.5
Net unrealized investment gains	122.8	77.2	101.9
Applicable closed block policyholder dividend obligation	122.8	77.2	101.9
Applicable deferred policy acquisition cost	29.2	37.4	64.2
Applicable other actuarial offsets	59.9	20.1	8.1
Applicable deferred income tax expense (benefit)	24.9	4.2	9.8
Offsets to net unrealized investment gains	114.0	61.7	82.1
Net unrealized investment gains (losses) included in OCI	$ 8.8	$ 15.5	$ 19.8