Revenue - Schedule of Regulated Operations Revenues: Pipeline and Storage Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Total Regulated operations revenues	$ 743,532	$ 521,932	$ 1,743,390	$ 1,369,690
Pipeline and Storage
Segment Reporting Information [Line Items]
Revenue from contracts with customers	66,949
Other revenues	44
Total Regulated operations revenues	66,993
Regulated gas transportation and storage revenues | Pipeline and Storage
Segment Reporting Information [Line Items]
Revenue from contracts with customers	61,977
NGL revenues | Pipeline and Storage
Segment Reporting Information [Line Items]
Revenue from contracts with customers	1,493
Other revenues | Pipeline and Storage
Segment Reporting Information [Line Items]
Revenue from contracts with customers	$ 3,479