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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 30, 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 three months ended March 30, 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 | (2.1 | ) |  | — |  |  | (0.5 | ) |  | (2.6 | )
Acquisitions and related adjustments | — |  |  | — |  |  | 1.3 |  |  | 1.3 |
Balance as of March 30, 2019 | $ | 284.1 |  |  | $ | 12.5 |  |  | $ | 604.3 |  |  | $ | 900.9 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
| March 30, 2019 |  | December 29, 2018
(Amounts in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Gross Carrying Value |  | Accumulated Amortization
Amortized other intangible assets: |  |  |  |  |  |  |
Customer relationships | $ | 172.6 |  |  | $ | (110.5 | ) |  | $ | 172.2 |  |  | $ | (107.6 | )
Developed technology | 18.8 |  |  | (18.6 | ) |  | 18.5 |  |  | (18.3 | )
Internally developed software | 158.0 |  |  | (117.9 | ) |  | 156.6 |  |  | (116.6 | )
Patents | 35.9 |  |  | (23.1 | ) |  | 35.7 |  |  | (22.9 | )
Trademarks | 3.2 |  |  | (2.0 | ) |  | 3.2 |  |  | (2.0 | )
Other | 7.5 |  |  | (3.0 | ) |  | 7.3 |  |  | (2.9 | )
Total | 396.0 |  |  | (275.1 | ) |  | 393.5 |  |  | (270.3 | )
Non-amortized trademarks | 109.6 |  |  | — |  |  | 109.7 |  |  | — |
Total other intangible assets | $ | 505.6 |  |  | $ | (275.1 | ) |  | $ | 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 | 8
Trademarks | 6
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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