Separate Accounts, Death Benefits and Other Insurance Benefit Features and Embedded Product Derivatives - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Insurance [Abstract]
Fair value of assets	$ 2,300,000,000		$ 2,300,000,000		$ 2,000,000,000
Fair value of embedded derivatives	107,400,000		107,400,000		78,900,000
Embedded derivatives gains and (losses) recognized in earnings	$ (400,000)	$ 5,900,000	$ (12,100,000)	$ 5,300,000