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SUPPLEMENTARY INFORMATION RELATING TO THE NATURE OF EXPENSES (Government assistance) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 14 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 02, 2022 | Jan. 03, 2021 | Jan. 03, 2022
Analysis of income and expense [abstract] |  |  |  |  |  |  |
Manufacturing costs |  |  |  |  |  | $ 108.4 |
Write-down of inventory to net realizable value |  |  |  |  | $ 55.2 | 108.1 |
Excess commodity contracts |  |  |  |  |  | 11.3 |
Costs of sales, transfers |  |  |  |  |  | 8.4 |
Net gain in costs of sales |  |  |  |  | 46.0 | 9.6 |
Disclosure of costs of sale [Line Items] |  |  |  |  |  |  |
Income from government grants and tax credits, CARES Act |  |  |  |  | 18.3 |  |
Accrued insurance recoveries |  |  |  |  | 100.7 | 111.0 | $ 212.8
Government assistance |  |  |  |  | 34.1 | 9.2 |
Government assistance related to employment subsidies |  |  |  |  | 0.0 | 3.9 |
Net gain in costs of sales |  |  |  |  | 46.0 | 9.6 |
Repairs, salary and benefits continuation, and other expense |  |  |  |  | 54.7 | 101.4 |
Manufacturing costs |  |  |  |  |  | 108.4 |
Write-down of inventory to net realizable value |  |  |  |  | 55.2 | 108.1 |
Excess commodity contracts |  |  |  |  |  | 11.3 |
Costs of sales, transfers |  |  |  |  |  | 8.4 |
Proceeds from insurance recoveries | $ 50.0 | $ 50.0 | $ 50.0 | $ 50.0 | 200.0 |  |
Retail product line |  |  |  |  |  |  |
Analysis of income and expense [abstract] |  |  |  |  |  |  |
Write-down of inventory to net realizable value |  |  |  |  | 4.2 |  |
Disclosure of costs of sale [Line Items] |  |  |  |  |  |  |
Write-down of inventory to net realizable value |  |  |  |  | 4.2 |  |
Write-down of property, plant and equipment |  |  |  |  | 4.6 |  |
Cash flows from operating activities |  |  |  |  |  |  |
Disclosure of costs of sale [Line Items] |  |  |  |  |  |  |
Accrued insurance recoveries |  |  |  |  |  | 50.0 |
Proceeds from insurance recoveries |  |  |  |  | 46.4 |  |
Cash flows from financing activities |  |  |  |  |  |  |
Disclosure of costs of sale [Line Items] |  |  |  |  |  |  |
Proceeds from insurance recoveries |  |  |  |  | 103.6 |  |
Financial assets included in prepaid expenses, deposits and other current assets |  |  |  |  |  |  |
Disclosure of costs of sale [Line Items] |  |  |  |  |  |  |
Accrued insurance recoveries |  |  |  |  | $ 12.8 | $ 61.0 |

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