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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Apr. 01, 2017
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 April 1, 2017, are as follows:
(Amounts in millions) |  | Commercial & Industrial Group |  |  | Snap-on Tools Group |  |  | Repair Systems & Information Group |  |  | Total |
Balance as of December 31, 2016 |  | $ | 242.4 |  |  | $ | 12.5 |  |  | $ | 640.6 |  |  | $ | 895.5 |
Currency translation |  |  | 7.4 |  |  |  | – |  |  |  | 5.6 |  |  |  | 13.0 |
Acquisitions and related adjustments |  |  | 0.2 |  |  |  | – |  |  |  | (48.9) |  |  |  | (48.7) |
Balance as of April 1, 2017 |  | $ | 250.0 |  |  | $ | 12.5 |  |  | $ | 597.3 |  |  | $ | 859.8 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
|  | April 1, 2017 |  |  | December 31, 2016 |
(Amounts in millions) |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |
Amortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 187.1 |  |  | $ | (89.3) |  |  | $ | 142.6 |  |  | $ | (86.0) |
Developed technology |  |  | 17.8 |  |  |  | (17.8) |  |  |  | 17.7 |  |  |  | (17.7) |
Internally developed software |  |  | 168.8 |  |  |  | (122.0) |  |  |  | 165.7 |  |  |  | (118.3) |
Patents |  |  | 32.3 |  |  |  | (21.8) |  |  |  | 31.9 |  |  |  | (21.5) |
Trademarks |  |  | 2.8 |  |  |  | (1.8) |  |  |  | 2.8 |  |  |  | (1.8) |
Other |  |  | 7.3 |  |  |  | (2.3) |  |  |  | 7.2 |  |  |  | (2.2) |
Total |  |  | 416.1 |  |  |  | (255.0) |  |  |  | 367.9 |  |  |  | (247.5) |
Non-amortized trademarks |  |  | 79.3 |  |  |  | – |  |  |  | 64.2 |  |  |  | – |
Total other intangible assets |  | $ | 495.4 |  |  | $ | (255.0) |  |  | $ | 432.1 |  |  | $ | (247.5) |
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
Internally developed software |  | 3
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://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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