Segment Information - Schedule of Segment Reporting Information (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	$ 1,267,409	$ 885,907	$ 4,061,953	$ 3,348,460
Segment net income (loss)	96,178	117,293	179,664	277,075
Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	1,239,076	861,704	3,955,477	3,222,600
Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	28,333	24,203	106,476	125,860
Segment net income (loss)	(9,061)	(563)	(35,274)	(1,366)
Natural Gas Distribution
Segment Reporting Information [Line Items]
Total Regulated operations revenues	676,539	521,932	1,676,397	1,369,690
Segment net income (loss)	111,795	118,715	180,215	194,234
Natural Gas Distribution | Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	676,539	521,932	1,676,397	1,369,690
Natural Gas Distribution | Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	0	0	0	0
Utility Infrastructure Services
Segment Reporting Information [Line Items]
Total Regulated operations revenues	523,877	363,975	2,318,563	1,978,770
Segment net income (loss)	(23,486)	(859)	17,793	84,207
Utility Infrastructure Services | Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	495,544	339,772	2,212,087	1,852,910
Utility Infrastructure Services | Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	28,333	24,203	106,476	125,860
Pipeline and Storage
Segment Reporting Information [Line Items]
Total Regulated operations revenues	66,993	0	66,993	0
Segment net income (loss)	16,930	0	16,930	0
Pipeline and Storage | Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	66,993	0	66,993	0
Pipeline and Storage | Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	$ 0	$ 0	$ 0	$ 0