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Contingencies (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 Party | Nov. 30, 2019 USD ($) | Mar. 31, 2016 Party mi | Jan. 02, 2021 USD ($) contaminant | Dec. 28, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss, Area of Land | mi |  |  | 8.3 |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | $ 1,380.0 |
Loss Contingency, Number of Parties | Party | 100 |  | 100 |  |
Number of Contaminants | contaminant |  |  |  | 8 |
Gain (Loss) Related to Litigation Settlement |  | $ 0.6 |  |  |
Insurance Environmental and Litigation Matters [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Reserves for insurance, environmental and litigation contingencies |  |  |  | $ 66.2 | $ 70.5
Insurance Settlements Receivable, Noncurrent |  |  |  | 27.0 | $ 26.2
Settled Litigation [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Number of Parties | Party | 20 |  |  |  |
Pending Litigation [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | $ 165.0 |
Loss Contingency, Number of Parties | Party | 40 |  |  |  |
Plant, One [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Gain (Loss) Related to Litigation Settlement |  | 0.3 |  |  |
Plant, Two [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Gain (Loss) Related to Litigation Settlement |  | $ 0.3 |  |  |

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