Postretirement Benefit Plans - Benefit Obligation Assumptions (Details)	Dec. 31, 2015	Dec. 31, 2014
Postretirement Benefit Plans [Member]
Assumptions:
Discount rate	4.39%	3.95%

The interest rate used to adjust for the time value of money for the plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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