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Goodwill and Other Identifiable Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill by Segment | 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 |
Schedule of Finite-Lived Intangible Assets | 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 |
Schedule of Indefinite-Lived Intangible Assets | 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 |
Estimated Future Amortization Expense for Identifiable Intangible Assets | 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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