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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 903.8 | $ 834.1 | $ 2,712.3 | $ 2,540.6
Financial services revenue | 79.0 | 71.6 | 233.5 | 207.2
Total revenues | 982.8 | 905.7 | 2,945.8 | 2,747.8
Operating earnings | 209.1 | 208.2 | 669.4 | 626.5
Interest expense | (13.1) | (13.1) | (38.8) | (39.1)
Other income (expense) - net | (2.1) | (0.8) | (5.7) | (0.3)
Earnings before income taxes and equity earnings | 193.9 | 194.3 | 624.9 | 587.1
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,040.8 | 972.6 | 3,129.6 | 2,938.5
Operating earnings | 245.8 | 230.7 | 748.7 | 694.1
Operating Segments [Member] | Commercial & Industrial Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 314.6 | 289.3 | 923.3 | 862.0
Operating earnings | 50.1 | 43.7 | 134.4 | 124.1
Operating Segments [Member] | Snap-on Tools Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 392.7 | 397.2 | 1,215.9 | 1,216.4
Operating earnings | 56.3 | 64.6 | 207.2 | 207.6
Operating Segments [Member] | Repair Systems & Information Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 333.5 | 286.1 | 990.4 | 860.1
Operating earnings | 83.4 | 71.8 | 244.0 | 215.3
Operating Segments [Member] | Financial Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating earnings | 56.0 | 50.6 | 163.1 | 147.1
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (137.0) | (138.5) | (417.3) | (397.9)
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating earnings | $ (36.7) | $ (22.5) | $ (79.3) | $ (67.6)

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