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Pension and other post-retirement benefits - Target Plan Asset Allocation (Details) | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage | 100.00%
Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage | 69.00%
Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage | 31.00%
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 | 22.00%
Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage | 78.00%
Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation percentage | 51.00%

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- Definition 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. + References No definition available. + Details
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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 + Details
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