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Employee benefit plans - Schedule of Pension Plan Weighted-Average Asset Allocations (Details) - Pension Benefits	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure
Weighted-average asset allocations	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure
Weighted-average asset allocations	5.00%	4.10%
Equity securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	56.20%	57.40%
Corporate bonds
Defined Benefit Plan Disclosure
Weighted-average asset allocations	23.60%	27.60%
U.S. Treasuries and Government agencies
Defined Benefit Plan Disclosure
Weighted-average asset allocations	15.20%	10.90%

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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/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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