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Employee benefit plans - Schedule of Pension Plan Weighted-Average Asset Allocations (Details) - Pension Benefits	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure
Weighted-average asset allocations	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure
Weighted-average asset allocations	4.10%	4.20%
Common equity securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	57.40%	58.00%
Corporate bonds
Defined Benefit Plan Disclosure
Weighted-average asset allocations	27.60%	26.20%
U.S. Government securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	10.90%	11.60%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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