Post Employment Plans - Target Asset Allocation Ranges (Details)	12 Months Ended
Dec. 31, 2016
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term asset allocation range, minimum	10.00%
Long-term asset allocation range, maximum	20.00%
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term asset allocation range, minimum	20.00%
Long-term asset allocation range, maximum	30.00%
Property [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term asset allocation range, minimum	0.00%
Long-term asset allocation range, maximum	10.00%
Absolute return fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term asset allocation range, minimum	30.00%
Long-term asset allocation range, maximum	40.00%
Insurance Contract, Rights and Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term asset allocation range, minimum	30.00%
Long-term asset allocation range, maximum	40.00%

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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