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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Other Intangible Assets |
Schedule of changes in the carrying amount of goodwill by segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Harsh |  | ​ | ​ | Interconnect |  | ​ | ​ |
​ | ​ | Environment | ​ | Communications | ​ | and Sensor | ​ | ​ | ​ |
​ | ​ | Solutions | ​ | Solutions | ​ | Systems | ​ | Total |
Goodwill at December 31, 2024 | ​ | $ | 3,180.0 | ​ | $ | 2,951.5 | ​ | $ | 2,104.7 | ​ | $ | 8,236.2 | ​
Acquisition-related | ​ |  | 351.0 | ​ |  | 873.4 | ​ |  | 236.1 | ​ |  | 1,460.5 | ​
Foreign currency translation | ​ |  | 37.3 | ​ |  | 31.5 | ​ |  | 103.1 | ​ |  | 171.9 | ​
Goodwill at September 30, 2025 | ​ | $ | 3,568.3 | ​ | $ | 3,856.4 | ​ | $ | 2,443.9 | ​ | $ | 9,868.6 | ​
Summary of the Company's amortizable intangible assets | Other than goodwill noted above, the Company’s intangible assets as of September 30, 2025 and December 31, 2024 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | September 30, 2025 | ​ | December 31, 2024
​ | Weighted | ​ | Gross |  | ​ |  | Net |  | Gross |  | ​ |  | Net
​ | Average | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Carrying | ​ | Accumulated | ​ | Carrying
​ | Life (years) | ​ | Amount | ​ | Amortization | ​ | Amount | ​ | Amount | ​ | Amortization | ​ | Amount
Customer relationships | 12 | ​ | $ | 1,560.0 | ​ | $ | 605.9 | ​ | $ | 954.1 | ​ | $ | 1,296.4 | ​ | $ | 519.8 | ​ | $ | 776.6
Proprietary technology | 13 | ​ |  | 963.9 | ​ |  | 214.1 | ​ | ​ | 749.8 | ​ |  | 350.3 | ​ |  | 170.9 | ​ | ​ | 179.4
Backlog and other | 1 | ​ |  | 178.8 | ​ |  | 169.5 | ​ | ​ | 9.3 | ​ |  | 154.1 | ​ |  | 154.1 | ​ | ​ | —
Total intangible assets (definite-lived) | 12 | ​ | ​ | 2,702.7 | ​ | ​ | 989.5 | ​ | ​ | 1,713.2 | ​ | ​ | 1,800.8 | ​ | ​ | 844.8 | ​ | ​ | 956.0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trade names (indefinite-lived) | ​ | ​ | ​ | 269.1 | ​ | ​ | ​ | ​ | ​ | 269.1 | ​ | ​ | 269.1 | ​ | ​ | ​ | ​ | ​ | 269.1
Total | ​ | ​ | $ | 2,971.8 | ​ | $ | 989.5 | ​ | $ | 1,982.3 | ​ | $ | 2,069.9 | ​ | $ | 844.8 | ​ | $ | 1,225.1
Summary of the Company's indefinite-lived intangible assets | Other than goodwill noted above, the Company’s intangible assets as of September 30, 2025 and December 31, 2024 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | September 30, 2025 | ​ | December 31, 2024
​ | Weighted | ​ | Gross |  | ​ |  | Net |  | Gross |  | ​ |  | Net
​ | Average | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Carrying | ​ | Accumulated | ​ | Carrying
​ | Life (years) | ​ | Amount | ​ | Amortization | ​ | Amount | ​ | Amount | ​ | Amortization | ​ | Amount
Customer relationships | 12 | ​ | $ | 1,560.0 | ​ | $ | 605.9 | ​ | $ | 954.1 | ​ | $ | 1,296.4 | ​ | $ | 519.8 | ​ | $ | 776.6
Proprietary technology | 13 | ​ |  | 963.9 | ​ |  | 214.1 | ​ | ​ | 749.8 | ​ |  | 350.3 | ​ |  | 170.9 | ​ | ​ | 179.4
Backlog and other | 1 | ​ |  | 178.8 | ​ |  | 169.5 | ​ | ​ | 9.3 | ​ |  | 154.1 | ​ |  | 154.1 | ​ | ​ | —
Total intangible assets (definite-lived) | 12 | ​ | ​ | 2,702.7 | ​ | ​ | 989.5 | ​ | ​ | 1,713.2 | ​ | ​ | 1,800.8 | ​ | ​ | 844.8 | ​ | ​ | 956.0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trade names (indefinite-lived) | ​ | ​ | ​ | 269.1 | ​ | ​ | ​ | ​ | ​ | 269.1 | ​ | ​ | 269.1 | ​ | ​ | ​ | ​ | ​ | 269.1
Total | ​ | ​ | $ | 2,971.8 | ​ | $ | 989.5 | ​ | $ | 1,982.3 | ​ | $ | 2,069.9 | ​ | $ | 844.8 | ​ | $ | 1,225.1

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