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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Jan. 01, 2022 | Jan. 02, 2021
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 4,842.5 | $ 4,601.7 | $ 3,942.2
Operating earnings | 1,207.2 | 1,123.5 | 880.5
Interest expense | (47.1) | (53.1) | (54.0)
Other income (expense) – net | 42.5 | 16.5 | 8.7
Earnings before income taxes and equity earnings | 1,202.6 | 1,086.9 | 835.2
Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,399.2 | 1,406.3 |
Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,072.0 | 1,938.6 |
Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,666.9 | 1,503.1 |
Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 349.7 | 349.7 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating earnings | 1,315.6 | 1,241.6 | 968.0
Operating Segments | Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating earnings | 197.6 | 209.9 | 153.7
Operating Segments | Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating earnings | 458.7 | 411.1 | 267.7
Operating Segments | Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating earnings | 393.3 | 348.6 | 298.0
Operating Segments | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating earnings | 266.0 | 272.0 | 248.6
Intersegment eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (645.3) | (596.0) |
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating earnings | (108.4) | (118.1) | (87.5)
Product And Services, Excluding Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 4,492.8 | 4,252.0 | 3,592.5
Operating earnings | 941.2 | 851.5 | 631.9
Product And Services, Excluding Financial Services | Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,058.3 | 1,095.6 |
Product And Services, Excluding Financial Services | Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,072.0 | 1,938.6 |
Product And Services, Excluding Financial Services | Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,362.5 | 1,217.8 |
Product And Services, Excluding Financial Services | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Product And Services, Excluding Financial Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 5,138.1 | 4,848.0 | 4,116.7
Product And Services, Excluding Financial Services | Operating Segments | Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,399.2 | 1,406.3 | 1,234.6
Product And Services, Excluding Financial Services | Operating Segments | Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,072.0 | 1,938.6 | 1,643.9
Product And Services, Excluding Financial Services | Operating Segments | Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,666.9 | 1,503.1 | 1,238.2
Product And Services, Excluding Financial Services | Operating Segments | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Product And Services, Excluding Financial Services | Intersegment eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (645.3) | (596.0) | (524.2)
Product And Services, Excluding Financial Services | Intersegment eliminations | Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 340.9 | 310.7 |
Product And Services, Excluding Financial Services | Intersegment eliminations | Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Product And Services, Excluding Financial Services | Intersegment eliminations | Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 304.4 | 285.3 |
Product And Services, Excluding Financial Services | Intersegment eliminations | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Financial Service |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 349.7 | 349.7 | 349.7
Operating earnings | 266.0 | 272.0 | $ 248.6
Financial Service | Commercial & Industrial Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Financial Service | Snap-on Tools Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Financial Service | Repair Systems & Information Group |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0.0 | 0.0 |
Financial Service | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 349.7 | $ 349.7 |

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