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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 27, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by segment for the nine months ended September 27, 2025, are as follows:
(Amounts in millions) | Commercial & Industrial Group |  | Snap-on Tools Group |  | Repair Systems & Information Group |  | Total
Balance as of December 28, 2024 | $ | 315.6 |  |  | $ | 12.4 |  |  | $ | 728.8 |  |  | $ | 1,056.8 |
Currency translation | 31.7 |  |  | — |  |  | 17.3 |  |  | 49.0 |
Balance as of September 27, 2025 | $ | 347.3 |  |  | $ | 12.4 |  |  | $ | 746.1 |  |  | $ | 1,105.8 |
Schedule of Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
| September 27, 2025 |  | December 28, 2024
(Amounts in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Amortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 79.4 |  |  | $ | (33.1) |  |  | $ | 46.3 |  |  | $ | 84.2 |  |  | $ | (35.1) |  |  | $ | 49.1 |
Developed technology | 26.5 |  |  | (25.3) |  |  | 1.2 |  |  | 26.6 |  |  | (23.1) |  |  | 3.5 |
Internally developed software | 190.6 |  |  | (144.2) |  |  | 46.4 |  |  | 179.6 |  |  | (135.6) |  |  | 44.0 |
Patents | 53.2 |  |  | (22.9) |  |  | 30.3 |  |  | 49.8 |  |  | (21.4) |  |  | 28.4 |
Trademarks | 4.1 |  |  | (2.7) |  |  | 1.4 |  |  | 3.8 |  |  | (2.5) |  |  | 1.3 |
Other | 6.3 |  |  | (3.0) |  |  | 3.3 |  |  | 6.1 |  |  | (2.9) |  |  | 3.2 |
Total | 360.1 |  |  | (231.2) |  |  | 128.9 |  |  | 350.1 |  |  | (220.6) |  |  | 129.5 |
Non-amortized trademarks | 146.5 |  |  | — |  |  | 146.5 |  |  | 138.1 |  |  | — |  |  | 138.1 |
Total other intangible assets | $ | 506.6 |  |  | $ | (231.2) |  |  | $ | 275.4 |  |  | $ | 488.2 |  |  | $ | (220.6) |  |  | $ | 267.6 |
Schedule of Weighted-Average Amortization Period by Major Class | The weighted-average amortization periods related to other intangible assets are as follows:
| In Years
Customer relationships | 14
Developed technology | 5
Internally developed software | 6
Patents | 15
Trademarks | 9
Other | 39

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