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Goodwill and Other Intangible Assets - (Tables) | 9 Months Ended
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Sep. 28, 2019
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 28, 2019, are as follows:
(Amounts in millions) | Commercial & Industrial Group |  | Snap-on Tools Group |  | Repair Systems & Information Group |  | Total
Balance as of December 29, 2018 | $ | 286.2 |  |  | $ | 12.5 |  |  | $ | 603.5 |  |  | $ | 902.2 |
Currency translation | (11.7) |  |  | — |  |  | (5.8) |  |  | (17.5) |
Acquisitions and related adjustments | 6.4 |  |  | — |  |  | 29.0 |  |  | 35.4 |
Balance as of September 28, 2019 | $ | 280.9 |  |  | $ | 12.5 |  |  | $ | 626.7 |  |  | $ | 920.1 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
| September 28, 2019 |  |  |  | December 29, 2018 |  |
(Amounts in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Gross Carrying Value |  | Accumulated Amortization
Amortized other intangible assets: |  |  |  |  |  |  |
Customer relationships | $ | 171.3 |  |  | $ | (114.3) |  |  | $ | 172.2 |  |  | $ | (107.6) |
Developed technology | 18.4 |  |  | (18.3) |  |  | 18.5 |  |  | (18.3) |
Internally developed software | 165.1 |  |  | (122.6) |  |  | 156.6 |  |  | (116.6) |
Patents | 37.3 |  |  | (23.4) |  |  | 35.7 |  |  | (22.9) |
Trademarks | 3.3 |  |  | (2.0) |  |  | 3.2 |  |  | (2.0) |
Other | 7.1 |  |  | (3.0) |  |  | 7.3 |  |  | (2.9) |
Total | 402.5 |  |  | (283.6) |  |  | 393.5 |  |  | (270.3) |
Non-amortized trademarks | 106.3 |  |  | — |  |  | 109.7 |  |  | — |
Total other intangible assets | $ | 508.8 |  |  | $ | (283.6) |  |  | $ | 503.2 |  |  | $ | (270.3) |
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=108376223&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=108376223&loc=d3e13854-109267 + Details
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