Separate Accounts, Death Benefits and Other Insurance Benefit Features and Embedded Product Derivatives - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Insurance [Abstract]
Assets Supporting Fixed Indexed Annuities, Fair Value	$ 1,900,000,000		$ 1,900,000,000		$ 1,800,000,000
Assets transferred to pension plan trustee					464,200,000
Fair value of embedded derivatives	69,000,000		69,000,000		51,200,000
Embedded derivatives gains and (losses) recognized in earnings	$ 8,400,000	$ 6,600,000	$ 13,700,000	$ 6,100,000