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Pensions - Assumptions (Details)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]      
Discount rate 2.60% 2.40% 2.60%
Yield on pension assets 2.60% 2.40% 2.60%
Wage growth 2.75% 2.50% 2.50%
G regulation [1] 2.50% 2.25% 2.25%
Pension adjustment 0.80% 0.50% 0.00%
Average remaining service period 18 18 19
[1] Increase of social security base amount ('G') as per Norwegian regulations.