RETIREMENT BENEFIT PLANS - Asset allocations (Details) - Pension benefits	Dec. 31, 2020	Dec. 31, 2019
United States
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	100.00%	100.00%
United States | Real estate and other
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	23.00%	16.00%
United States | Fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	43.00%	50.00%
United States | Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	34.00%	34.00%
Non-U.S.
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	100.00%	100.00%
Non-U.S. | Fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	55.00%	33.00%
Non-U.S. | Insurance contract and other (a)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	31.00%	30.00%
Non-U.S. | Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Actual allocation, percentage	14.00%	37.00%
Minimum | United States | Real estate and other
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	15.00%
Minimum | United States | Fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	45.00%
Minimum | United States | Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	25.00%
Minimum | Non-U.S. | Fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	50.00%
Minimum | Non-U.S. | Insurance contract and other (a)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	15.00%
Minimum | Non-U.S. | Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	10.00%
Maximum | United States | Real estate and other
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	25.00%
Maximum | United States | Fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	55.00%
Maximum | United States | Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	35.00%
Maximum | Non-U.S. | Fixed income securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	70.00%
Maximum | Non-U.S. | Insurance contract and other (a)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	30.00%
Maximum | Non-U.S. | Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Plan assets, target allocation, Percentage	30.00%