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Goodwill and Other Intangible Assets - (Tables) | 9 Months Ended
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Oct. 02, 2021
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 October 2, 2021, are as follows:
(Amounts in millions) | Commercial & Industrial Group |  | Snap-on Tools Group |  | Repair Systems & Information Group |  | Total
Balance as of January 2, 2021 | $ | 331.2 |  |  | $ | 12.4 |  |  | $ | 638.8 |  |  | $ | 982.4 |
Currency translation | (12.6) |  |  | — |  |  | (8.0) |  |  | (20.6) |
Acquisitions and related adjustments | 14.0 |  |  | — |  |  | 195.2 |  |  | 209.2 |
Balance as of October 2, 2021 | $ | 332.6 |  |  | $ | 12.4 |  |  | $ | 826.0 |  |  | $ | 1,171.0 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
| October 2, 2021 |  | January 2, 2021
(Amounts in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Gross Carrying Value |  | Accumulated Amortization
Amortized other intangible assets: |  |  |  |  |  |  |
Customer relationships | $ | 190.0 |  |  | $ | (137.8) |  |  | $ | 191.5 |  |  | $ | (130.1) |
Developed technology | 21.8 |  |  | (20.6) |  |  | 21.8 |  |  | (19.9) |
Internally developed software | 180.7 |  |  | (136.2) |  |  | 172.2 |  |  | (128.0) |
Patents | 44.4 |  |  | (25.0) |  |  | 43.2 |  |  | (25.3) |
Trademarks | 4.0 |  |  | (2.4) |  |  | 3.9 |  |  | (2.4) |
Other | 8.2 |  |  | (4.0) |  |  | 8.2 |  |  | (3.9) |
Total | 449.1 |  |  | (326.0) |  |  | 440.8 |  |  | (309.6) |
Non-amortized trademarks | 126.5 |  |  | — |  |  | 129.6 |  |  | — |
Total other intangible assets | $ | 575.6 |  |  | $ | (326.0) |  |  | $ | 570.4 |  |  | $ | (309.6) |
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 | 3
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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