Note 6—Goodwill and Intangible Assets

The change in goodwill by segment for 2025 and 2024 was as follows (in millions):

Utilities

Energy

Total

Balance at December 31, 2023

$

703.5

$

154.2

$

857.7

Goodwill adjustments during the period

(0.8)

(0.8)

Balance at December 31, 2024

703.5

153.4

856.9

Goodwill adjustments during the period

 

Balance at December 31, 2025

$

703.5

$

153.4

$

856.9

The $0.8 million adjustment in 2024 relates to a disposal of assets within the Energy reporting unit.

There were no impairments of goodwill for the years ended December 31, 2025, 2024 and 2023.

The table below summarizes the intangible asset categories, which are generally amortized on a straight-line basis (in millions):

December 31, 2025

December 31, 2024

Gross Carrying
Amount

  ​ ​ ​

Accumulated
Amortization

  ​ ​ ​

Intangible Assets, Net

  ​ ​ ​

Gross Carrying
Amount

  ​ ​ ​

Accumulated
Amortization

  ​ ​ ​

Intangible Assets, Net

Tradenames

$

19.2

$

(19.2)

$

$

19.2

$

(18.1)

$

1.1

Customer relationships

 

296.0

 

(105.8)

 

190.2

 

296.0

 

(89.2)

 

206.8

Total

$

315.2

$

(125.0)

$

190.2

$

315.2

$

(107.3)

$

207.9

Amortization expense of intangible assets was $17.7 million, $19.6 million and $21.8 million for the years ended December 31, 2025, 2024 and 2023, respectively.

Estimated future amortization expense for intangible assets as of December 31, 2025, is as follows (in millions):

Estimated

Intangible

Amortization

For the Years Ending December 31, 

  ​ ​ ​

Expense

2026

$

16.1

2027

 

15.6

2028

 

14.4

2029

14.4

2030

 

14.4

Thereafter

 

115.3

$

190.2

Historical Timeline

Fiscal YearFiled
2025Feb 24, 2026Showing above
2024Feb 25, 2025
2023Feb 27, 2024
2022Feb 28, 2023
2021Mar 1, 2022
2020Feb 23, 2021
2019Feb 25, 2020
2018Feb 28, 2019
2017Feb 26, 2018
2016Feb 28, 2017
2015Feb 29, 2016

About Goodwill & Intangibles Disclosures

Goodwill and intangible asset disclosures reveal the premium paid in acquisitions and how management assesses whether that premium retains its value. Since goodwill is no longer amortized under US GAAP, the annual impairment test is the only mechanism that adjusts carrying values downward — making the assumptions behind that test critically important for investors.

Key signals: a history of goodwill impairments suggests management consistently overpays for acquisitions. Watch the gap between reporting unit fair value and carrying amount — when fair value exceeds carrying amount by less than 10-20%, a small decline in business performance could trigger a write-down. For finite-lived intangibles, examine useful life assumptions across customer relationships, technology, and trade names; aggressive estimates inflate near-term earnings. Compare total intangibles-to-total-assets ratios against peers to assess acquisition dependency. Rising goodwill as a percentage of equity can signal balance sheet fragility.