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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details)
3 Months Ended
Mar. 29, 2020
USD ($)
plan
Mar. 31, 2019
USD ($)
Dec. 29, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Retirement plan expenses $ 3,600,000 $ 3,900,000  
Accumulated benefit obligation, defined benefit pension plans $ 327,900,000   $ 369,100,000
Weighted average duration of defined benefit obligation 28 years 1 month 13 days    
Expenses related to defined contribution plans $ 3,600,000    
U.S.      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Number of defined contribution plans | plan 2    
Mexico      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Number of defined contribution plans | plan 3    
U.K. and Europe      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Number of defined contribution plans | plan 2    
Fixed income securities | Union Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Fixed income securities | GK Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 35.00%    
Fixed income securities | U.K. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 28.00%    
Equity securities | Union Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Equity securities | GK Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 60.00%    
Equity securities | U.K. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 62.00%    
Real estate | GK Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 5.00%    
Real estate | U.K. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 10.00%    
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Expected contributions, remainder of 2020 (less than for other postretirement plans) $ 12,400,000    
Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Impact of 0.25% change in discount rate on projected benefit obligation 1,000    
Expected contributions, remainder of 2020 (less than for other postretirement plans) $ 300,000