Contingencies (Details)		3 Months Ended	12 Months Ended
	May 03, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) lease	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Damages awarded	$ 3,200,000	$ 3,200,000
Number of leases allegedly breached | lease			49
Accrual for environmental investigation and remediation activities			$ 4,400,000	$ 8,200,000
Loss contingency receivable			1,500,000
Minimum
Loss Contingencies [Line Items]
Estimate of additional expenses			0
Maximum
Loss Contingencies [Line Items]
Estimate of additional expenses			$ 4,000,000