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Pension and other post-retirement benefits - Target Plan Asset Allocation (Details)	Dec. 31, 2017
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	70.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	30.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	0.00%
Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	49.00%
Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	21.00%
Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	79.00%
Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	51.00%

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+ References

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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