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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 27, 2020 USD ($) plan | Dec. 29, 2019 USD ($) | Dec. 30, 2018 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Retirement plan expenses | $ | $ 17.4 | $ 19.0 | $ 12.1
Weighted average duration of defined benefit obligation | 27 years 6 months |  |
Expenses related to defined contribution plans | $ | $ 14.1 | 13.7 | $ 11.4
U.S. |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined contribution plans, number of plans | 2 |  |
Mexico |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined contribution plans, number of plans | 3 |  |
U.K. and Europe |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined contribution plans, number of plans | 2 |  |
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Accumulated benefit obligation, defined benefit pension plans | $ | $ 404.2 | $ 369.1 |
Expected contributions during 2021 | $ | $ 7.5 |  |
Pension Benefits | Qualified Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Number of plans | 4 |  |
Pension Benefits | Nonqualified Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Number of plans | 2 |  |
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Number of plans | 1 |  |
Expected contributions during 2021 | $ | $ 0.2 |  |
Union plan | Pension Benefits | Fixed income funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 50.00% |  |
GK Pension Plan | Pension Benefits | Fixed income funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 35.00% |  |
GK Pension Plan | Pension Benefits | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 60.00% |  |
GK Pension Plan | Pension Benefits | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 5.00% |  |
U.K. Plans | Pension Benefits | Fixed income funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 28.00% |  |
U.K. Plans | Pension Benefits | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 62.00% |  |
U.K. Plans | Pension Benefits | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 10.00% |  |

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