Deferred Policy Acquisition Costs and Deferred Sales Inducements Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Policy Acquisition Costs [Line Items]
Deferred Policy Acquisition Costs, Unlocking Adjustment	$ 3.7	$ (9.1)	$ (1.4)
Deferred Sales Inducements, Unlocking Adjustment	$ 0.2	$ (5.0)	$ (0.3)