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Impairment of Contract Asset (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Mar. 31, 2022 | Mar. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Contract with customer, asset, after allowance for credit loss, noncurrent |  |  | $ 410.0
Cash payment option value for contract asset |  |  | $ 196.0
Impairment of contract asset | $ 29.3 | $ 184.9 |
Contract asset | $ 0.0 |  |
Equitrans Midstream |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interest, percentage sold during period |  |  | 50.00%

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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