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PENSIONS - Assumptions Used (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Weighted average assumptions used in calculating benefit obligation:    
Rate of compensation increase 2.20% 2.32%
Weighted average assumptions used in calculating net periodic benefit cost:    
Rate of compensation increase 2.32% 2.38%
Pensions    
Weighted average assumptions used in calculating benefit obligation:    
Discount rate 3.90% 3.40%
Weighted average assumptions used in calculating net periodic benefit cost:    
Discount rate 3.40% 3.87%
Expected return on plan assets 6.75% 6.75%