Investments Mortgage Loans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Maximum loan to value ratio generally allowed	75.00%
Commercial mortgage loans	$ 3,397,300,000	[1]	$ 2,874,000,000	[1]
Collective valuation allowance	(1,200,000)		(1,300,000)
Total net commercial mortgage loans	3,396,100,000		2,872,700,000
Impairments on mortgage loans	$ 0		$ 0		$ 0

[1] Balances do not include allowance for mortgage loan credit losses.