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RETIREMENT BENEFIT PLANS - Assumptions used (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other postretirement employee benefits    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 2.95% 4.05%
Effective interest rate on benefit obligation 2.50% 3.68%
United States | Pension benefits    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]    
Discount rate 2.31% 3.17%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 3.17% 4.24%
Effective interest rate on benefit obligation 2.73% 3.88%
Expected long-term rate of return on assets 6.00% 6.00%
United States | Other postretirement employee benefits    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]    
Discount rate 1.93% 2.95%
Non-U.S. | Pension benefits    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]    
Discount rate 1.44% 1.61%
Rate of compensation increase 3.23% 3.05%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 1.69% 2.28%
Effective interest rate on benefit obligation 2.19% 2.06%
Expected long-term rate of return on assets 4.75% 5.23%
Average rate of increase in compensation 3.10% 3.03%
United Kingdom    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]    
Discount rate 1.39% 1.97%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 1.82% 2.76%
Effective interest rate on benefit obligation 3.97% 5.00%