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Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets

Schedule of goodwill by reporting unit

The carrying amount of goodwill by reportable segment was as follows (in millions):

​

​	​	​	​	​	​	​
​	​	March 31,		​	December 31,
Reporting Segment	​ ​ ​	2026		​ ​ ​	2025
Utilities		$	703.5	​	$	703.5
Energy			153.4	​		153.4
Total Goodwill	​	$	856.9	​	$	856.9

​

Summary of intangible asset categories, amounts and the average amortization periods

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

March 31, 2026

​

December 31, 2025

​

Gross Carrying Amount

​ ​ ​

Accumulated Amortization

​ ​ ​

Intangible Assets, Net

​ ​ ​

Gross Carrying Amount

​ ​ ​

Accumulated Amortization

​ ​ ​

Intangible Assets, Net

Customer relationships

$

296.0

​

$

(109.9)

​

$

186.1

​

$

296.0

​

$

(105.8)

​

$

190.2

Schedule of estimated future amortization expense for intangible assets

Estimated future amortization expense for intangible assets is as follows (in millions):

​

​	​	​	​
​	​	Estimated
​	​	Intangible
​	​	Amortization
For the Years Ending December 31,	​ ​ ​	Expense
2026 (remaining nine months)	​	$	12.0
2027	​		16.0
2028	​		14.0
2029	​	​	14.0
2030	​		14.0
Thereafter	​		116.1
​	​	$	186.1

​

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