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REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | The following tables set forth the changes in our contract asset and contract liability balances for the periods indicated:
Contract Assets |  | (Millions of dollars)
Balance at January 1, 2018 (a) |  | $ | 6.4 |
Amounts invoiced in excess of revenue recognized |  | (0.9 | )
Net additions |  | 0.7 |
Balance at December 31, 2018 (b) |  | 6.2 |
Amounts invoiced in excess of revenue recognized |  | (1.7 | )
Net additions |  | 0.5 |
Balance at December 31, 2019 (c) |  | $ | 5.0 |
(a) - Balance includes $0.9 million of current assets. (b) - Contract assets of $1.7 million and $4.5 million are included in other current assets and other assets, respectively, in our Consolidated Balance Sheet. (c) - Contract assets of $1.3 million and $3.7 million are included in other current assets and other assets, respectively, in our Consolidated Balance Sheet.
Contract Liabilities |  | (Millions of dollars)
Balance at January 1, 2018 (a) |  | $ | 33.3 |
Revenue recognized included in beginning balance |  | (19.5 | )
Net additions |  | 17.9 |
Balance at December 31, 2018 (b) |  | 31.7 |
Revenue recognized included in beginning balance |  | (15.6 | )
Net additions |  | 41.0 |
Balance at December 31, 2019 (c) |  | $ | 57.1 |
(a) - Balance includes $19.5 million of current liabilities. (b) - Contract liabilities of $15.6 million and $16.1 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet. (c) - 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.
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, 2019, 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 24 years:
Expected Period of Recognition in Revenue |  | (Millions of dollars)
2020 |  | $ | 343.5 |
2021 |  | 290.4 |
2022 |  | 214.8 |
2023 |  | 166.4 |
2024 and beyond |  | 807.2 |
Total estimated transaction price allocated to unsatisfied performance obligations |  | $ | 1,822.3 |

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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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