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Goodwill and Other Identifiable Intangible Assets | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Identifiable Intangible Assets | Goodwill and Other Identifiable Intangible Assets The changes in the carrying amount of goodwill by reportable segment were as follows:
In millions | December 31, 2024 | Acquisitions/ divestitures |  |  | Foreign currency translation/other | September 30, 2025
Systems Protection | $ | 790.1 |  | $ | 399.6 |  |  |  | $ | 13.6 |  | $ | 1,203.3 |
Electrical Connections | 1,431.7 |  | 43.8 |  |  |  | — |  | 1,475.5 |
Total goodwill | $ | 2,221.8 |  | $ | 443.4 |  |  |  | $ | 13.6 |  | $ | 2,678.8 |
Identifiable intangible assets consisted of the following:
| September 30, 2025 |  | December 31, 2024
In millions | Cost | Accumulated amortization | Net |  | Cost | Accumulated amortization | Net
Definite-life intangibles |  |  |  |  |  |  |
Customer relationships | $ | 1,903.4 |  | $ | (527.2) |  | $ | 1,376.2 |  |  | $ | 1,571.7 |  | $ | (458.7) |  | $ | 1,113.0 |
Proprietary technology and patents | 111.5 |  | (28.4) |  | 83.1 |  |  | 78.2 |  | (19.5) |  | 58.7 |
Other finite-lived intangible assets | 139.5 |  | (49.5) |  | 90.0 |  |  | 63.7 |  | (18.9) |  | 44.8 |
Total definite-life intangibles | 2,154.4 |  | (605.1) |  | 1,549.3 |  |  | 1,713.6 |  | (497.1) |  | 1,216.5 |
Indefinite-life intangibles |  |  |  |  |  |  |
Trade names | 367.6 |  | — |  | 367.6 |  |  | 370.5 |  | — |  | 370.5 |
Total intangibles | $ | 2,522.0 |  | $ | (605.1) |  | $ | 1,916.9 |  |  | $ | 2,084.1 |  | $ | (497.1) |  | $ | 1,587.0 |
Identifiable intangible asset amortization expense was $41.9 million and $26.8 million for the three months ended September 30, 2025 and 2024, respectively, and $106.0 million and $66.7 million for the nine months ended September 30, 2025 and 2024, respectively. Estimated future amortization expense for identifiable intangible assets during the remainder of 2025 and the next five years is as follows:
| Q4 |  |  |  |  |
In millions | 2025 | 2026 | 2027 | 2028 | 2029 | 2030
Estimated amortization expense | $ | 41.1 |  | $ | 153.8 |  | $ | 136.3 |  | $ | 111.0 |  | $ | 111.0 |  | $ | 107.8 |

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- Definition The entire disclosure for goodwill and intangible assets. + 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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