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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block] The following tables display our revenue by major source based on product and service type for the three and nine months ended September 30, 2025 and 2024:
Three Months Ended September 30, 2025Three Months Ended September 30, 2024
(in millions)Regulated EnergyUnregulated EnergyOther Businesses and EliminationsTotalRegulated EnergyUnregulated EnergyOther Businesses and EliminationsTotal
Energy distribution
Delaware natural gas$10.9 $— $— $10.9 $9.5 $— $— $9.5 
Florida natural gas distribution
42.3 — — 42.3 36.9 — — 36.9 
Florida City Gas40.8 — — 40.8 33.4 — — 33.4 
FPU electric distribution30.7 — — 30.7 29.9 — — 29.9 
Maryland natural gas (1)
8.6 — — 8.6 8.3 — — 8.3 
Total energy distribution133.3 — — 133.3 118.0 — — 118.0 
Energy transmission
Aspire Energy— 6.0 — 6.0 — 4.6 — 4.6 
Aspire Energy Express0.4 — — 0.4 0.4 — — 0.4 
Eastern Shore20.7 — — 20.7 19.6 — — 19.6 
Peninsula Pipeline14.6 — — 14.6 8.9 — — 8.9 
Total energy transmission35.7 6.0 — 41.7 28.9 4.6 — 33.5 
Energy generation
Eight Flags— 4.9 — 4.9 — 4.3 — 4.3 
Propane operations
Propane delivery operations— 22.2 — 22.2 — 22.9 — 22.9 
CNG / RNG Services
Marlin Gas Services— 6.7 — 6.7 — 3.8 — 3.8 
Other RNG— 1.0 — 1.0 — 0.1 — 0.1 
Total CNG / RNG Services— 7.7 — 7.7 — 3.9 — 3.9 
Other Businesses and Eliminations
Eliminations(22.6)(0.1)(7.5)(30.2)(16.3)(0.1)(6.0)(22.4)
Total operating revenues (2)
$146.4 $40.7 $(7.5)$179.6 $130.6 $35.6 $(6.0)$160.2 
(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.
(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.
Nine Months Ended September 30, 2025Nine Months Ended September 30, 2024
(in millions)Regulated EnergyUnregulated EnergyOther Businesses and EliminationsTotalRegulated EnergyUnregulated EnergyOther Businesses and EliminationsTotal
Energy distribution
Delaware natural gas$68.7 $— $— $68.7 $54.8 $— $— $54.8 
Florida natural gas distribution
140.2 — — 140.2 124.8 — — 124.8 
Florida City Gas123.9 — — 123.9 101.8 — — 101.8 
FPU electric distribution80.1 — — 80.1 72.4 — — 72.4 
Maryland natural gas (1)
44.6 — — 44.6 38.0 — — 38.0 
Total energy distribution457.5 — — 457.5 391.8 — — 391.8 
Energy transmission
Aspire Energy— 33.6 — 33.6 — 23.5 — 23.5 
Aspire Energy Express1.1 — — 1.1 1.1 — — 1.1 
Eastern Shore64.6 — — 64.6 60.7 — — 60.7 
Peninsula Pipeline36.4 — — 36.4 25.0 — — 25.0 
Total energy transmission102.1 33.6 — 135.7 86.8 23.5 — 110.3 
Energy generation
Eight Flags— 14.2 — 14.2 — 13.3 — 13.3 
Propane operations
Propane delivery operations— 123.4 — 123.4 — 112.5 — 112.5 
CNG / RNG Services
Marlin Gas Services— 21.2 — 21.2 — 10.9 — 10.9 
Other RNG— 3.1 — 3.1 — 0.1 — 0.1 
Total CNG / RNG Services— 24.3 — 24.3 — 11.0 — 11.0 
Other Businesses and Eliminations
Eliminations(61.8)(0.2)(22.0)(84.0)(48.9)(0.2)(17.6)(66.7)
Total operating revenues (2)
$497.8 $195.3 $(22.0)$671.1 $429.7 $160.1 $(17.6)$572.2 
(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.
(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.
Contract with Customer, Asset and Liability [Table Text Block] The balances of our trade receivables, contract assets, and contract liabilities as of December 31, 2024 and September 30, 2025 were as follows:
Trade ReceivablesContract Assets (Current)Contract Assets (Non-current)Contract Liabilities (Current)
(in millions)
Balance at 12/31/2024$66.2 $— $3.0 $1.2 
Balance at 9/30/2025
69.2 — 3.0 1.4 
Increase (Decrease)$3.0 $— $— $0.2 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue for these businesses for the remaining performance obligations, at September 30, 2025, are expected to be recognized as follows:
(in millions)2025202620272028202920302031 and thereafter
Eastern Shore and Peninsula Pipeline$10.7 $37.4 $33.5 $31.1 $28.7 $22.9 $109.9 
Natural gas distribution operations3.6 11.3 9.1 10.0 9.9 9.9 29.1 
FPU electric distribution0.2 1.0 0.6 0.6 0.6 — — 
Total revenue contracts with remaining performance obligations$14.5 $49.7 $43.2 $41.7 $39.2 $32.8 $139.0