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Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers | $ 892.7 |  | $ 2,772.3 |  |  |
Net sales | 980.1 | $ 982.8 | 3,035.2 | $ 2,945.8 |  |
Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 330.2 |  | 999.6 |  |  |
Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 389.8 |  | 1,206.4 |  |  |
Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 314.4 |  | 994.5 |  |  |
Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 82.0 |  | 247.0 |  |  |
Intersegment eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | (136.3) | (137.0) | (412.3) | (417.3) |  |
Operating Segments |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 1,034.4 | 1,040.8 | 3,200.5 | 3,129.6 |  |
Operating Segments | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 330.2 | 314.6 | 999.6 | 923.3 |  |
Operating Segments | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 389.8 | 392.7 | 1,206.4 | 1,215.9 |  |
Operating Segments | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 314.4 | 333.5 | 994.5 | 990.4 |  |
Other revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 5.4 |  | 15.9 |  |  |
Product And Services, Excluding Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 898.1 | 903.8 | 2,788.2 | 2,712.3 | $ 3,686.9 | $ 3,430.4
Product And Services, Excluding Financial Services | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 255.7 |  | 781.6 |  |  |
Product And Services, Excluding Financial Services | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 389.8 |  | 1,206.4 |  |  |
Product And Services, Excluding Financial Services | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 252.6 |  | 800.2 |  |  |
Product And Services, Excluding Financial Services | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | North America |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 632.9 |  | 1,918.5 |  |  |
Product And Services, Excluding Financial Services | North America | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 119.9 |  | 345.7 |  |  |
Product And Services, Excluding Financial Services | North America | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 335.4 |  | 1,020.5 |  |  |
Product And Services, Excluding Financial Services | North America | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 177.6 |  | 552.3 |  |  |
Product And Services, Excluding Financial Services | North America | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | Europe |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 160.0 |  | 539.9 |  |  |
Product And Services, Excluding Financial Services | Europe | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 70.4 |  | 229.9 |  |  |
Product And Services, Excluding Financial Services | Europe | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 32.0 |  | 117.2 |  |  |
Product And Services, Excluding Financial Services | Europe | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 57.6 |  | 192.8 |  |  |
Product And Services, Excluding Financial Services | Europe | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | All other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 105.2 |  | 329.8 |  |  |
Product And Services, Excluding Financial Services | All other | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 65.4 |  | 206.0 |  |  |
Product And Services, Excluding Financial Services | All other | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 22.4 |  | 68.7 |  |  |
Product And Services, Excluding Financial Services | All other | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 17.4 |  | 55.1 |  |  |
Product And Services, Excluding Financial Services | All other | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | Intersegment eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | (136.3) |  | (412.3) |  |  |
Product And Services, Excluding Financial Services | Intersegment eliminations | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 74.5 |  | 218.0 |  |  |
Product And Services, Excluding Financial Services | Intersegment eliminations | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | Intersegment eliminations | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 61.8 |  | 194.3 |  |  |
Product And Services, Excluding Financial Services | Intersegment eliminations | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | Operating Segments |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 898.1 |  | 2,788.2 |  |  |
Product And Services, Excluding Financial Services | Operating Segments | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 330.2 |  | 999.6 |  |  |
Product And Services, Excluding Financial Services | Operating Segments | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 389.8 |  | 1,206.4 |  |  |
Product And Services, Excluding Financial Services | Operating Segments | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 314.4 |  | 994.5 |  |  |
Product And Services, Excluding Financial Services | Operating Segments | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | Vehicle service professionals |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 663.8 |  | 2,076.1 |  |  |
Product And Services, Excluding Financial Services | Vehicle service professionals | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 21.4 |  | 69.5 |  |  |
Product And Services, Excluding Financial Services | Vehicle service professionals | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 389.8 |  | 1,206.4 |  |  |
Product And Services, Excluding Financial Services | Vehicle service professionals | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 252.6 |  | 800.2 |  |  |
Product And Services, Excluding Financial Services | Vehicle service professionals | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | All other professionals |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 234.3 |  | 712.1 |  |  |
Product And Services, Excluding Financial Services | All other professionals | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 234.3 |  | 712.1 |  |  |
Product And Services, Excluding Financial Services | All other professionals | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | All other professionals | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Product And Services, Excluding Financial Services | All other professionals | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Financial Service |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 82.0 | $ 79.0 | 247.0 | $ 233.5 |  |
Financial Service | Commercial & Industrial Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Financial Service | Snap-on Tools Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Financial Service | Repair Systems & Information Group |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 0.0 |  | 0.0 |  |  |
Financial Service | Financial Services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 82.0 |  | 247.0 |  |  |
Financial Service | Intersegment eliminations |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | $ 0.0 |  | $ 0.0 |  |  |

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