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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 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 nine months ended September 30, 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 |  |  | 29.1 |  |  |  | – |  |  |  | 16.5 |  |  |  | 45.6 |
Acquisitions and related adjustments |  |  | 25.7 |  |  |  | – |  |  |  | (42.8) |  |  |  | (17.1) |
Balance as of September 30, 2017 |  | $ | 297.2 |  |  | $ | 12.5 |  |  | $ | 614.3 |  |  | $ | 924.0 |
Other Intangible Assets by Major Class | Additional disclosures related to other intangible assets are as follows:
|  | September 30, 2017 |  |  | December 31, 2016 |
(Amounts in millions) |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |
Amortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 175.5 |  |  | $ | (95.6) |  |  | $ | 142.6 |  |  | $ | (86.0) |
Developed technology |  |  | 18.9 |  |  |  | (18.4) |  |  |  | 17.7 |  |  |  | (17.7) |
Internally developed software |  |  | 174.5 |  |  |  | (129.7) |  |  |  | 165.7 |  |  |  | (118.3) |
Patents |  |  | 33.7 |  |  |  | (22.5) |  |  |  | 31.9 |  |  |  | (21.5) |
Trademarks |  |  | 2.9 |  |  |  | (1.9) |  |  |  | 2.8 |  |  |  | (1.8) |
Other |  |  | 7.7 |  |  |  | (2.6) |  |  |  | 7.2 |  |  |  | (2.2) |
Total |  |  | 413.2 |  |  |  | (270.7) |  |  |  | 367.9 |  |  |  | (247.5) |
Non-amortized trademarks |  |  | 115.8 |  |  |  | – |  |  |  | 64.2 |  |  |  | – |
Total other intangible assets |  | $ | 529.0 |  |  | $ | (270.7) |  |  | $ | 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 |  |  |  | 15 |
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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