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REVENUES (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability [Table Text Block] The following table sets forth the changes in our contract liability balances for the periods indicated:
Contract Liabilities
(Millions of dollars)
Balance at January 1, 2019$31.7 
Revenue recognized included in beginning balance(15.6)
Net additions41.0 
Balance at December 31, 2019 (a)57.1 
Revenue recognized included in beginning balance (c)(36.1)
Net additions20.4 
Balance at December 31, 2020 (b)$41.4 
(a) - Contract liabilities of $22.2 million and $34.9 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
(b) - Contract liabilities of $23.7 million and $17.7 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
(c) - Includes a contract settlement of revenue previously deferred.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] The following table presents aggregate value allocated to unsatisfied performance obligations as of December 31, 2020, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 23 years:
Expected Period of Recognition in Revenue
(Millions of dollars)
2021$328.2 
2022263.0 
2023235.4 
2024197.9 
2025 and beyond762.0 
Total estimated transaction price allocated to unsatisfied performance obligations$1,786.5