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RETIREMENT BENEFIT PLANS (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Gain (loss) recognized within accumulated other comprehensive loss $ 4,600,000 $ (9,000,000.0)  
Accumulated benefit obligation 61,500,000 61,100,000  
Benefit plans, assets 37,825,000 30,770,000 $ 31,103,000
Plan assets expected to be returned next twelve months 0    
Contributions expected to be paid to plan 2,300,000    
Total contributions made 6,700,000 $ 8,600,000 $ 8,100,000
Deferred compensation plan, fair value of assets 2,000,000.0    
Austria, France, and Germany      
Defined Benefit Plan Disclosure [Line Items]      
Benefit plans, assets $ 0