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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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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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