5. Deferred Policy Acquisition Costs (Details) (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]
Deferred Policy Acquisition Costs:
Policy acquisition costs deferred	$ 69.8	$ 100.7	$ 10.1
Costs amortized to expenses:
Recurring costs	(102.6)	(108.1)	(149.1)
Assumption unlocking	(1.4)	(1.3)	(50.9)
Realized investment gains (losses)	0.5	(0.1)	2.0
Offsets to net unrealized investment gains or losses included in AOCI(1)	(29.2)	(37.4)	(64.2)
Cumulative effect of adoption of new accounting guidance(2)			(0.6)
Change in deferred policy acquisition costs	(62.9)	(46.2)	(252.7)
Deferred policy acquisition costs, beginning of period	489.1	535.3	788.0
Deferred policy acquisition costs, end of period	$ 426.2	$ 489.1	$ 535.3