Separate Accounts, Death Benefits and Other Insurance Benefit Features and Embedded Product Derivatives - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Insurance [Abstract]
Assets Supporting Fixed Indexed Annuities, Fair Value	$ 1,700,000,000		$ 1,800,000,000
Assets transferred to pension plan trustee	464,200,000
Fair value of embedded derivatives	63,400,000		51,200,000
Embedded derivatives gains and (losses) recognized in earnings	$ (600,000)	$ 23,000,000