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PENSIONS - Asset Allocation (Details) - Pensions
Dec. 31, 2017
Dec. 31, 2016
Marine Scheme    
Pensions:    
Target allocation 100.00% 100.00%
Marine Scheme | Equity    
Pensions:    
Target allocation 0.00%  
Marine Scheme | Equity | Minimum    
Pensions:    
Target allocation   30.00%
Marine Scheme | Equity | Maximum    
Pensions:    
Target allocation   65.00%
Marine Scheme | Bonds    
Pensions:    
Target allocation 0.00%  
Marine Scheme | Bonds | Minimum    
Pensions:    
Target allocation   10.00%
Marine Scheme | Bonds | Maximum    
Pensions:    
Target allocation   50.00%
Marine Scheme | Cash    
Pensions:    
Target allocation 100.00%  
Marine Scheme | Cash | Minimum    
Pensions:    
Target allocation   20.00%
Marine Scheme | Cash | Maximum    
Pensions:    
Target allocation   40.00%
UK Scheme    
Pensions:    
Target allocation 100.00% 100.00%
UK Scheme | Equity    
Pensions:    
Target allocation 76.50% 75.20%
UK Scheme | Bonds    
Pensions:    
Target allocation 23.50% 24.80%