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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%