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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 30, 2026
Goodwill and Intangible Assets |
Goodwill and Intangible Assets | Note 6—Goodwill and Intangible Assets ​ The change in goodwill by reportable segment for the six months ended June 30, 2026, was as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Utilities | ​ | Energy | ​ | Total
Balance at December 31, 2025 | ​ | $ | 703.5 | ​ | $ | 153.4 | ​ | $ | 856.9
Goodwill acquired during the period | ​ |  | — | ​ | ​ | 194.6 | ​ | ​ | 194.6
Balance at June 30, 2026 | ​ | $ | 703.5 | ​ | $ | 348.0 | ​ | $ | 1,051.5
​ The table below shows the intangible asset amounts, which are amortized on a straight-line basis (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | June 30, 2026 | ​ | December 31, 2025
​ | Gross Carrying Amount | ​ ​ ​ | Accumulated Amortization | ​ ​ ​ | Intangible Assets, Net | ​ ​ ​ | Gross Carrying Amount | ​ ​ ​ | Accumulated Amortization | ​ ​ ​ | Intangible Assets, Net
Customer relationships | $ | 424.1 | ​ | $ | (115.3) | ​ | $ | 308.8 | ​ | $ | 296.0 | ​ | $ | (105.8) | ​ | $ | 190.2
Tradename | ​ | 46.4 | ​ | ​ | (0.8) | ​ | ​ | 45.6 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Backlog | ​ | 24.9 | ​ | ​ | (4.1) | ​ | ​ | 20.8 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total | $ | 495.4 | ​ | $ | (120.2) | ​ | $ | 375.2 | ​ | $ | 296.0 | ​ | $ | (105.8) | ​ | $ | 190.2
​ Amortization expense of intangible assets was $10.4 million and $4.6 million for the three months ended June 30, 2026, and 2025, respectively, and $14.4 million and $9.2 million for the six months ended June 30, 2026 and 2025, respectively. Estimated future amortization expense for intangible assets is as follows (in millions): ​
​ | ​ | ​ | ​
​ | ​ | Estimated
​ | ​ | Intangible
​ | ​ | Amortization
For the Years Ending December 31, | ​ ​ ​ | Expense
2026 (remaining 6 months) | ​ | $ | 27.1
2027 | ​ |  | 37.1
2028 | ​ |  | 27.6
2029 | ​ | ​ | 27.6
2030 | ​ |  | 27.6
Thereafter | ​ |  | 228.2
​ | ​ | $ | 375.2
​

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- Definition The entire disclosure for intangible asset and goodwill. Includes, but is not limited to, finite- and indefinite-lived intangible assets, capitalized cost for internal-use software and software to be sold, leased, or marketed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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