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Other (Notes)	9 Months Ended
Other (Notes)	Sep. 30, 2018
Other Income and Expenses [Abstract]
Other	OTHER The Advances for construction costs on the accompanying Condensed Consolidated Balance Sheet are associated with advances received from a third party related to construction costs on the Atlantic Sunrise project. This balance increases as we receive additional advances. In October 2018, the project was placed into service and the related liabilities will be reclassified to debt and reduced by payments we make to the third party under terms of the applicable lease agreement.