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REVENUE REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | The following table sets forth the balances in contract liabilities for the periods indicated:
Contract Liabilities |  | (Millions of dollars)
Balance at December 31, 2020 (a) |  | $ | 41.4 |
Revenue recognized included in beginning balance |  | (20.4) |
Net additions |  | 12.3 |
Balance at March 31, 2021 (b) |  | $ | 33.3 |
(a) - 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. (b) - Contract liabilities of $15.9 million and $17.4 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | The following table presents aggregate value allocated to unsatisfied performance obligations as of March 31, 2021, 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)
Remainder of 2021 |  | $ | 247.6 |
2022 |  | 273.4 |
2023 |  | 244.3 |
2024 |  | 204.1 |
2025 and beyond |  | 796.1 |
Total estimated transaction price allocated to unsatisfied performance obligations |  | $ | 1,765.5 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
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