Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and EquipmentIn September 2022, Gulf South Pipeline Company, LLC (Gulf South), a wholly owned subsidiary of the Company, submitted an application with the FERC seeking authorization to reclassify 13.5 billion cubic feet (Bcf) of working gas as additional base gas. The reclassification was necessary to reflect changing operational needs and was supported, among other things, by an operational study of certain storage assets. In the first quarter 2023, the FERC comment period closed with no protests. As of March 31, 2023, as a result of the operational need for the base gas, Gulf South reclassified the carrying amount of approximately $47.8 million of natural gas to Property, Plant and Equipment, of which $40.9 million had been recorded in Gas Stored Underground within Current Assets, and $6.9 million had been recorded in Gas Stored Underground within Other Assets. The application was approved by the FERC in April 2023.