Property, Plant and Equipment - Schedule of Recognized Impairments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Impairment of assets	$ 0	$ 20,000,000	[1],[2]	$ 0	[1],[2]
United States
Property, Plant and Equipment [Line Items]
Impairment of assets	$ 0	$ 20,000,000		$ 0

[1] ¹ Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.

[2] Reclassified to conform with current presentation (see Note E)