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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2025
Text Block [Abstract]  
Goodwill and Other Intangible Assets GOODWILL AND OTHER INTANGIBLE ASSETS
The carrying value of goodwill as of December 31, 2025 and 2024 was as follows:
(in millions)Regulated EnergyUnregulated EnergyTotal Goodwill
Balance at December 31, 2024$468.3 $39.4 $507.7 
Reductions (1)
— (0.2)(0.2)
Balance at December 31, 2025$468.3 $39.2 $507.5 
(1) Adjustments in the Unregulated Energy segment relate to the sale of certain assets in our propane distribution business during 2025.

There were no goodwill impairments recognized during the three-year period ended December 31, 2025.
The carrying value and accumulated amortization of intangible assets subject to amortization as of December 31, 2025 and 2024 were as follows:
As of December 31,
 20252024
(in millions)Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Customer relationships$17.0 $9.2 $17.0 $8.2 
Non-Compete agreements
3.1 2.7 3.1 2.3 
Patents (1)
6.6 1.6 6.6 1.2 
Other0.3 0.3 0.3 0.3 
Total$27.0 $13.8 $27.0 $12.0 
(1) Includes amounts related to patented technology developed by Marlin Gas Services and the acquisition of Planet Found.
The customer relationships, non-compete agreements, patents and other intangible assets acquired in the purchases of the operating assets of several companies are being amortized over a weighted average of 15 years. Amortization expense of intangible assets for the years ended December 31, 2025, 2024 and 2023 was $1.8 million, $1.9 million and $1.8 million, respectively. Amortization expense of intangible assets is expected to be $1.6 million for 2026, $1.5 million for 2027, $1.3 million for 2028