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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Oct. 03, 2015
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 month period ended October 3, 2015, are as follows:
(Amounts in millions) |  | Commercial & Industrial Group |  |  | Snap-on Tools Group |  |  | Repair Systems & Information Group |  |  | Total |
Balance as of January 3, 2015 |  | $ | 275.9 |  |  | $ | 12.5 |  |  | $ | 522.3 |  |  | $ | 810.7 |
Currency translation |  |  | (20.0 | ) |  |  | — |  |  |  | (3.1 | ) |  |  | (23.1 | )
Acquisition |  |  | — |  |  |  | — |  |  |  | 11.1 |  |  |  | 11.1 |
Balance as of October 3, 2015 |  | $ | 255.9 |  |  | $ | 12.5 |  |  | $ | 530.3 |  |  | $ | 798.7 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
|  | October 3, 2015 |  |  | January 3, 2015 |
(Amounts in millions) |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |
Amortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 146.6 |  |  | $ | (77.7 | ) |  | $ | 147.1 |  |  | $ | (71.2 | )
Developed technology |  |  | 19.0 |  |  |  | (19.0 | ) |  |  | 19.2 |  |  |  | (19.2 | )
Internally developed software |  |  | 152.8 |  |  |  | (102.2 | ) |  |  | 142.2 |  |  |  | (92.0 | )
Patents |  |  | 29.8 |  |  |  | (20.8 | ) |  |  | 29.3 |  |  |  | (20.6 | )
Trademarks |  |  | 2.5 |  |  |  | (1.6 | ) |  |  | 2.5 |  |  |  | (1.6 | )
Other |  |  | 7.8 |  |  |  | (1.9 | ) |  |  | 7.6 |  |  |  | (1.6 | )
Total |  |  | 358.5 |  |  |  | (223.2 | ) |  |  | 347.9 |  |  |  | (206.2 | )
Non-amortized trademarks |  |  | 60.1 |  |  |  | — |  |  |  | 61.6 |  |  |  | — |
Total other intangible assets |  | $ | 418.6 |  |  | $ | (223.2 | ) |  | $ | 409.5 |  |  | $ | (206.2 | )
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
Internally developed software |  | 3
Patents |  | 9
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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