Contingencies (Details)		1 Months Ended			9 Months Ended
	Jun. 30, 2018 Party	Oct. 31, 2020 USD ($)	Nov. 30, 2019 USD ($)	Mar. 31, 2016 Party mi	Sep. 26, 2020 USD ($) contaminant	Dec. 28, 2019 USD ($)
Loss Contingencies [Line Items]
Area of land | mi				8.3
Estimate of possible loss					$ 1,380,000,000
Number of parties | Party	100			100
Number of contaminants | contaminant					8
Loss related to litigation settlement			$ 600,000
Subsequent Event
Loss Contingencies [Line Items]
Loss related to litigation settlement		$ (297,500)
Insurance Environmental and Litigation Matters [Member]
Loss Contingencies [Line Items]
Reserves for insurance, environmental and litigation contingencies					$ 64,400,000	$ 70,500,000
Insurance settlements receivable					26,200,000	$ 26,200,000
Settled Litigation [Member]
Loss Contingencies [Line Items]
Number of parties | Party	20
Pending Litigation [Member]
Loss Contingencies [Line Items]
Estimate of possible loss					$ 165,000,000
Number of parties | Party	40
Plant, One [Member]
Loss Contingencies [Line Items]
Loss related to litigation settlement			300,000
Plant, Two [Member]
Loss Contingencies [Line Items]
Loss related to litigation settlement			$ 300,000