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Intangible and Other Assets (Tables) | 9 Months Ended
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Sep. 28, 2013
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 September 28, 2013, are as follows:
(Amounts in millions) |  | Commercial & Industrial Group |  |  | Snap-on Tools Group |  |  | Repair Systems & Information Group |  |  | Total |
Balance as of December 29, 2012 |  | $ | 306.9 |  |  | $ | 12.5 |  |  | $ | 488.0 |  |  | $ | 807.4 |
Currency translation |  |  | 5.0 |  |  |  | — |  |  |  | 0.3 |  |  |  | 5.3 |
Acquisition |  |  | — |  |  |  | — |  |  |  | 24.7 |  |  |  | 24.7 |
Balance as of September 28, 2013 |  | $ | 311.9 |  |  | $ | 12.5 |  |  | $ | 513.0 |  |  | $ | 837.4 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
|  | September 28, 2013 |  |  | December 29, 2012 |
(Amounts in millions) |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |
Amortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 140.4 |  |  | $ | (60.5 | ) |  | $ | 135.3 |  |  | $ | (54.1 | )
Developed technology |  |  | 19.4 |  |  |  | (19.0 | ) |  |  | 19.4 |  |  |  | (18.8 | )
Internally developed software |  |  | 121.4 |  |  |  | (76.8 | ) |  |  | 107.2 |  |  |  | (66.1 | )
Patents |  |  | 28.6 |  |  |  | (20.1 | ) |  |  | 28.1 |  |  |  | (19.4 | )
Trademarks |  |  | 2.8 |  |  |  | (1.6 | ) |  |  | 2.6 |  |  |  | (1.4 | )
Other |  |  | 7.2 |  |  |  | (1.3 | ) |  |  | 7.1 |  |  |  | (1.2 | )
Total |  |  | 319.8 |  |  |  | (179.3 | ) |  |  | 299.7 |  |  |  | (161.0 | )
Non-amortized trademarks |  |  | 52.0 |  |  |  | — |  |  |  | 48.5 |  |  |  | — |
Total other intangible assets |  | $ | 371.8 |  |  | $ | (179.3 | ) |  | $ | 348.2 |  |  | $ | (161.0 | )
Weighted-Average Amortization Period by Major Class | The weighted-average amortization periods related to other intangible assets are as follows:
|  | In Years |
Customer relationships |  |  | 16 |
Developed technology |  |  | 5 |
Internally developed software |  |  | 3 |
Patents |  |  | 10 |
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=14024403&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=14024403&loc=d3e13854-109267 + Details
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