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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 29, 2018
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 29, 2018, are as follows:
(Amounts in millions) | Commercial & Industrial Group |  | Snap-on Tools Group |  | Repair Systems & Information Group |  | Total
Balance as of December 30, 2017 | $ | 298.4 |  |  | $ | 12.5 |  |  | $ | 613.2 |  |  | $ | 924.1 |
Currency translation | (8.8 | ) |  | — |  |  | (5.5 | ) |  | (14.3 | )
Acquisitions and related adjustments | 4.1 |  |  | — |  |  | — |  |  | 4.1 |
Balance as of September 29, 2018 | $ | 293.7 |  |  | $ | 12.5 |  |  | $ | 607.7 |  |  | $ | 913.9 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
| September 29, 2018 |  | December 30, 2017
(Amounts in millions) | Gross Carrying Value |  | Accumulated Amortization |  | Gross Carrying Value |  | Accumulated Amortization
Amortized other intangible assets: |  |  |  |  |  |  |
Customer relationships | $ | 173.5 |  |  | $ | (105.6 | ) |  | $ | 175.2 |  |  | $ | (98.2 | )
Developed technology | 18.8 |  |  | (18.5 | ) |  | 18.9 |  |  | (18.4 | )
Internally developed software | 182.9 |  |  | (142.9 | ) |  | 177.0 |  |  | (133.4 | )
Patents | 35.0 |  |  | (22.9 | ) |  | 34.1 |  |  | (22.7 | )
Trademarks | 3.1 |  |  | (1.9 | ) |  | 3.0 |  |  | (2.0 | )
Other | 7.4 |  |  | (2.9 | ) |  | 7.7 |  |  | (2.7 | )
Total | 420.7 |  |  | (294.7 | ) |  | 415.9 |  |  | (277.4 | )
Non-amortized trademarks | 111.8 |  |  | — |  |  | 115.2 |  |  | — |
Total other intangible assets | $ | 532.5 |  |  | $ | (294.7 | ) |  | $ | 531.1 |  |  | $ | (277.4 | )
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 | 4
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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