Post Retirement Benefit Plans - Assumptions (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Minimum
Assumptions used to determine projected benefit obligations
Discount rate (as a percent)	0.20%	0.20%	0.30%
Expected return on plan assets (as a percent)	0.00%	0.00%	0.00%
Expected rate of compensation increase (as a percent)	1.00%	1.00%	1.00%
Maximum
Assumptions used to determine projected benefit obligations
Discount rate (as a percent)	2.10%	2.10%	2.50%
Expected return on plan assets (as a percent)	3.00%	3.00%	3.00%
Expected rate of compensation increase (as a percent)	3.00%	3.00%	3.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the calculation of the benefit obligation.

No definition available.

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- Definition

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

+ References

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=65897934&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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)(2)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- References

No definition available.

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