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Pension benefits (Details 3) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.00% | 4.70% | 4.80%
Rate of increase in compensation level | 6.00% | 6.00% | 7.00%
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 9.80% | 9.50% | 12.00%
Rate of increase in compensation level | 9.00% | 9.00% | 9.00%

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- Definition The interest rate used to adjust for the time value of money for the 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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