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Historical cost associated with enhanced treatment.

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Loss contingency estimated recovery from third party percent.

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Loss contingency, number of water supply wells.

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Pretax accruals for environmental contingencies included in provision for discontinued operations.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Estimated amount of loss resulting from an adverse tax position.

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Amount awarded to other party in judgment or settlement of litigation.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Legal Proceedings and Other Matters - Additional Information (Details)		1 Months Ended		3 Months Ended			6 Months Ended
	Jul. 22, 2020 GBP (£)	Feb. 28, 2017 USD ($)	Jun. 30, 2016 USD ($)	Aug. 01, 2020 USD ($) Well	Feb. 01, 2020 USD ($)	Aug. 03, 2019 USD ($)	Aug. 01, 2020 USD ($) Well	Aug. 03, 2019 USD ($)	Apr. 30, 2015 USD ($)
Loss Contingencies [Line Items]
Number of water supply wells \| Well				2			2
Amount related to outstanding environmental contingencies				$ 1,500,000	$ 1,500,000	$ 1,700,000	$ 1,500,000	$ 1,700,000
Pretax accrual charges for environmental contingencies included in loss from discontinued operations				200,000		$ 300,000	200,000	$ 400,000
Schuh Limited
Loss Contingencies [Line Items]
Unpaid rent, service charges and insurance sought to recover \| £	£ 845,500
Court fees and interest \| £	£ 10,000
Internal Revenue Service (IRS)
Loss Contingencies [Line Items]
Estimated possible loss					$ 4,200,000
Village of Garden City, New York
Loss Contingencies [Line Items]
Future operation and maintenance costs							126,400
Amount awarded to other party			$ 10,000,000.0
Minimum
Loss Contingencies [Line Items]
Historical cost associated with enhanced treatment required by the impact of groundwater plume							1,800,000
Maximum
Loss Contingencies [Line Items]
Historical cost associated with enhanced treatment required by the impact of groundwater plume							2,500,000
Environmental Monitoring, Operation and Maintenance Activities \| Minimum
Loss Contingencies [Line Items]
Estimated possible loss				1,700,000			1,700,000
Environmental Monitoring, Operation and Maintenance Activities \| Maximum
Loss Contingencies [Line Items]
Estimated possible loss				2,000,000.0			2,000,000.0
EPA Interim Oversight Costs
Loss Contingencies [Line Items]
Estimated possible loss				$ 1,250,000			$ 1,250,000
Response Costs Claimed by the EPA
Loss Contingencies [Line Items]
Estimated possible loss									$ 2,200,000
Amount awarded to other party		$ 1,500,000
Estimated recovery percent from settlement		75.00%
Estimated recovery amount from a third party		$ 500,000