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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 954.6 | $ 921.4 | $ 1,890.1 | $ 1,808.5
Financial services revenue | 82.0 | 77.7 | 165.0 | 154.5
Total revenues | 1,036.6 | 999.1 | 2,055.1 | 1,963.0
Operating earnings | 250.9 | 238.3 | 485.5 | 461.0
Interest expense | (12.0) | (13.0) | (25.6) | (25.7)
Other income (expense) – net | (0.6) | (1.9) | 2.2 | (4.3)
Earnings before income taxes and equity earnings | 238.3 | 223.4 | 462.1 | 431.0
Commercial & Industrial Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Financial services revenue | 0.0 |  | 0.0 |
Total revenues | 337.8 |  | 669.4 |
Snap-on Tools Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Financial services revenue | 0.0 |  | 0.0 |
Total revenues | 411.9 |  | 816.6 |
Repair Systems & Information Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Financial services revenue | 0.0 |  | 0.0 |
Total revenues | 343.1 |  | 680.1 |
Financial Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Financial services revenue | 82.0 |  | 165.0 |
Total revenues | 82.0 |  | 165.0 |
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,092.8 | 1,061.9 | 2,166.1 | 2,088.8
Operating earnings | 274.5 | 260.5 | 532.6 | 504.3
Operating Segments | Commercial & Industrial Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 337.8 | 310.0 | 669.4 | 608.7
Operating earnings | 49.0 | 43.0 | 95.5 | 84.9
Operating Segments | Snap-on Tools Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 411.9 | 413.8 | 816.6 | 823.2
Operating earnings | 79.0 | 80.7 | 147.9 | 151.0
Operating Segments | Repair Systems & Information Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 343.1 | 338.1 | 680.1 | 656.9
Operating earnings | 88.7 | 82.2 | 174.5 | 161.3
Operating Segments | Financial Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating earnings | 57.8 | 54.6 | 114.7 | 107.1
Intersegment eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (138.2) | (140.5) | (276.0) | (280.3)
Total revenues | (138.2) |  | (276.0) |
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating earnings | $ (23.6) | $ (22.2) | $ (47.1) | $ (43.3)

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