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PENSIONS - Asset Allocation (Details) - Pensions
Dec. 31, 2018
Dec. 31, 2017
Marine Scheme    
Pensions:    
Target allocation 100.00% 100.00%
Marine Scheme | Cash    
Pensions:    
Target allocation 100.00% 10000.00%
UK Scheme    
Pensions:    
Target allocation 100.00% 100.00%
UK Scheme | Equity    
Pensions:    
Target allocation 100.00% 76.50%
UK Scheme | Bonds    
Pensions:    
Target allocation 0.00% 23.50%