v3.26.1
Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2026
Goodwill and Intangible Assets  
Schedule of change in goodwill by reportable segment

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Utilities

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Energy

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Total

Balance at December 31, 2025

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$

703.5

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$

153.4

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$

856.9

Goodwill acquired during the period

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—

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​

194.6

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​

194.6

Balance at June 30, 2026

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$

703.5

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$

348.0

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$

1,051.5
Summary of intangible asset amounts, amortized on a straight-line basis

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

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June 30, 2026

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December 31, 2025

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Gross Carrying
Amount

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Accumulated
Amortization

  ​ ​ ​

Intangible Assets, Net

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Gross Carrying
Amount

  ​ ​ ​

Accumulated
Amortization

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Intangible Assets, Net

Customer relationships

$

424.1

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$

(115.3)

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$

308.8

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$

296.0

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$

(105.8)

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$

190.2

Tradename

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46.4

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(0.8)

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45.6

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—

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—

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—

Backlog

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24.9

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(4.1)

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20.8

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—

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—

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—

Total

$

495.4

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$

(120.2)

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$

375.2

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$

296.0

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$

(105.8)

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$

190.2
Schedule of estimated future amortization expense for intangible assets

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Estimated

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Intangible

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Amortization

For the Years Ending December 31, 

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Expense

2026 (remaining 6 months)

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$

27.1

2027

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37.1

2028

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27.6

2029

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27.6

2030

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27.6

Thereafter

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228.2

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$

375.2

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