Commitments, Contingent Liabilities and Litigation and Regulatory Matters (Narrative) (Details) $ in Millions	1 Months Ended
	Jan. 31, 2012 state	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Obligation Commercial Mortgage Loan		$ 62.0	$ 37.0
Purchase Obligation To Purchase Or Fund Investments		52.0	$ 68.0
Loss Contingency, Range of Possible Loss, Maximum (less than)		$ 7.5
Number of States Needed for Agreement to Become Effective | state	20