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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 28, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 28, 2020
USD ($)
plan
Jun. 30, 2019
USD ($)
Dec. 29, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Retirement plan expenses $ 3,500,000 $ 5,700,000 $ 7,100,000 $ 9,600,000  
Accumulated benefit obligation, defined benefit pension plans 381,000,000.0   $ 381,000,000.0   $ 369,100,000
Weighted average duration of defined benefit obligation     27 years 9 months 21 days    
Expenses related to defined contribution plans $ 3,600,000   $ 7,200,000    
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%   50.00%    
Fixed income securities | GK Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 35.00%   35.00%    
Fixed income securities | U.K. Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 28.00%   28.00%    
Equity securities | Union Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 50.00%   50.00%    
Equity securities | GK Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 60.00%   60.00%    
Equity securities | U.K. Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 62.00%   62.00%    
Real estate | GK Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 5.00%   5.00%    
Real estate | U.K. Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 10.00%   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) $ 9,600,000   $ 9,600,000    
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) $ 200,000   $ 200,000