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Goodwill and Other Intangible Assets - (Tables) | 9 Months Ended
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Sep. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by segment for the nine months ended September 26, 2020, are as follows:
(Amounts in millions) | Commercial & Industrial Group |  | Snap-on Tools Group |  | Repair Systems & Information Group |  | Total
Balance as of December 28, 2019 | $ | 286.2 |  |  | $ | 12.5 |  |  | $ | 615.1 |  |  | $ | 913.8 |
Currency translation | 11.3 |  |  | — |  |  | 4.7 |  |  | 16.0 |
Acquisitions and related adjustments | — |  |  | — |  |  | 8.7 |  |  | 8.7 |
Balance as of September 26, 2020 | $ | 297.5 |  |  | $ | 12.5 |  |  | $ | 628.5 |  |  | $ | 938.5 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
| September 26, 2020 |  |  |  | December 28, 2019 |  |
(Amounts in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Gross Carrying Value |  | Accumulated Amortization
Amortized other intangible assets: |  |  |  |  |  |  |
Customer relationships | $ | 183.5 |  |  | $ | (125.8) |  |  | $ | 182.9 |  |  | $ | (117.9) |
Developed technology | 19.7 |  |  | (19.2) |  |  | 19.8 |  |  | (18.9) |
Internally developed software | 169.1 |  |  | (124.8) |  |  | 168.0 |  |  | (125.4) |
Patents | 41.2 |  |  | (24.6) |  |  | 38.5 |  |  | (23.7) |
Trademarks | 3.8 |  |  | (2.2) |  |  | 3.5 |  |  | (2.1) |
Other | 7.8 |  |  | (3.7) |  |  | 7.3 |  |  | (3.1) |
Total | 425.1 |  |  | (300.3) |  |  | 420.0 |  |  | (291.1) |
Non-amortized trademarks | 116.8 |  |  | — |  |  | 115.0 |  |  | — |
Total other intangible assets | $ | 541.9 |  |  | $ | (300.3) |  |  | $ | 535.0 |  |  | $ | (291.1) |
Weighted-Average Amortization Period by Major Class | The weighted-average amortization periods related to other intangible assets are as follows:
| In Years
Customer relationships | 15
Developed technology | 2
Internally developed software | 6
Patents | 7
Trademarks | 5
Other | 39

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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