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Revenue Recognition Disegragation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenues $ 179,600 $ 160,200 $ 671,100 $ 572,200
Revenue from Contract with Customer, Excluding Assessed Tax 179,600 [1] 160,200 [1] 671,100 [2] 572,200 [2]
Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 146,400 130,600 497,800 429,700
Revenue from Contract with Customer, Excluding Assessed Tax 146,400 [1] 130,600 [1] 497,800 [2] 429,700 [2]
Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 40,700 35,600 195,300 160,100
Revenue from Contract with Customer, Excluding Assessed Tax 40,700 [1] 35,600 [1] 195,300 [2] 160,100 [2]
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (7,500) [1] (6,000) [1] (22,000) [2] (17,600) [2]
Other [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 100 200 600 900
Other [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 100 100 300 300
Energy Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 133,300 118,000 457,500 391,800
Energy Distribution [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 133,300 118,000 457,500 391,800
Energy Distribution [Member] | Delaware natural gas division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 10,900 9,500 68,700 54,800
Energy Distribution [Member] | FPU Electric Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 30,700 29,900 80,100 72,400
Energy Distribution [Member] | Florida Public Utilities Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 42,300 36,900 140,200 124,800
Energy Distribution [Member] | Maryland Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,600 [3] 8,300 [3] 44,600 [4] 38,000 [4]
Energy Distribution [Member] | Florida City Gas | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 40,800 33,400 123,900 101,800
Energy Transmission [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 41,700 33,500 135,700 110,300
Energy Transmission [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 35,700 28,900 102,100 86,800
Energy Transmission [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,000 4,600 33,600 23,500
Energy Transmission [Member] | Aspire [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,000 4,600 33,600 23,500
Energy Transmission [Member] | Eastern Shore Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 20,700 19,600 64,600 60,700
Energy Transmission [Member] | Peninsula Pipeline [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 14,600 8,900 36,400 25,000
Energy Transmission [Member] | Aspire Energy Express | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 400 400 1,100 1,100
Energy Generation [Member] | Eight Flags [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,900 4,300 14,200 13,300
Propane Delivery [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22,200 22,900 123,400 112,500
Energy Services [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 7,700 3,900 24,300 11,000
Energy Services [Member] | Marlin Gas Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,700 3,800 21,200 10,900
Energy Services [Member] | Marlin Gas Services [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax   3,800   10,900
Energy Services [Member] | Other RNG | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,000 100 3,100 100
Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (30,200) (22,400) (84,000) (66,700)
Eliminations [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (22,600) (16,300) (61,800) (48,900)
Eliminations [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (100) (100) (200) (200)
Eliminations [Member] | Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ (7,500) $ (6,000) $ (22,000) $ (17,600)
[1] (2) Total operating revenues for the three months ended September 30, 2025 include other revenue (revenues from sources other than contracts with customers) of $0.1 million and $0.1 million for our Regulated Energy and Unregulated Energy segments, respectively, and $0.2 million and $0.1 million for our Regulated Energy and Unregulated Energy segments for the three months ended September 30, 2024. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland natural gas operations and late fees
[2] 2) Total operating revenues for the nine months ended September 30, 2025 include other revenue (revenues from sources other than contracts with customers) of $0.6 million and $0.3 million for our Regulated Energy and Unregulated Energy segments, respectively, and $0.9 million and $0.3 million for our Regulated Energy and Unregulated Energy segments, respectively, for the nine months ended September 30, 2024. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland natural gas operations and late fees.
[3]
(1) In accordance with the Maryland PSC approval of our natural gas base rate proceeding, effective April 2025, our natural gas distribution businesses in Maryland (Maryland natural gas division, Sandpiper Energy and Elkton Gas) are now consolidated for rate-making and other purposes and are reflected on a consolidated basis for all periods presented consistent with the final rate order. See Note 5, Rates and Other Regulatory Activities, for additional information.
[4]
(1) In accordance with the Maryland PSC approval of our natural gas base rate proceeding, effective April 2025, our natural gas distribution businesses in Maryland (Maryland natural gas division, Sandpiper Energy and Elkton Gas) are now consolidated for rate-making and other purposes and are reflected on a consolidated basis for all periods presented consistent with the final rate order. See Note 5, Rates and Other Regulatory Activities, for additional information.