Environmental Commitments and Contingencies Summary of Environmental Liabilities (Tables)

3 Months Ended

Mar. 31, 2021

Environmental Commitments and Contingencies [Abstract]

Environmental Remedies [Table Text Block]

MGP Site (Jurisdiction)	Status	Estimated Clean-Up Costs
West Palm Beach (Florida)	Remedial actions approved by the Florida Department of Environmental Protection have been implemented on the east parcel of the site. Similar remedial actions have been initiated on the site's west parcel, and construction of active remedial systems are expected be completed in 2021.	Between $3.3 million to $14.2 million, including costs associated with the relocation of FPU’s operations at this site, and any potential costs associated with future redevelopment of the properties.