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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%