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Gains and Losses on Divestitures, Impairments and Other Write-downs - Investment in Ruby (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Impairment of Long-lived assets and equity investments [Line Items] |  |  |  |
Current portion of debt |  | $ 4,049.0 | $ 3,385.0 |
Equity Method Investments |  | 7,874.0 | 7,653.0 |
Ruby Pipeline Holding Company LLC |  |  |  |
Impairment of Long-lived assets and equity investments [Line Items] |  |  |  |
Equity Method Investments |  |  | 0.0 |
Ruby Pipeline Holding Company LLC | Ruby Chapter 11 Bankruptcy Filing [Member] | Other, net |  |  |  |
Impairment of Long-lived assets and equity investments [Line Items] |  |  |  |
Litigation Settlement, Expense |  |  | 28.5 |
Ruby Pipeline Holding Company LLC | Ruby Unsecured Notes Due April 1, 2022 |  |  |  |
Impairment of Long-lived assets and equity investments [Line Items] |  |  |  |
Current portion of debt |  |  | 475.0 |
Ruby Pipeline Holding Company LLC | Natural Gas Pipelines | Notes Receivable |  |  |  |
Impairment of Long-lived assets and equity investments [Line Items] |  |  |  |
Impairments of equity investments | $ 117.0 | $ 0.0 | $ 0.0 | $ 117.0

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- Definition Amount of debt and lease obligation, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 + Details
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