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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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