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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues									$ 4,070.4	$ 4,000.3	$ 3,711.8
Operating earnings									956.1	882.1	861.1
Interest expense									(50.4)	(52.4)	(52.2)
Other income (expense) – net									4.2	(7.8)	(7.5)
Earnings before income taxes and equity earnings									909.9	821.9	801.4
Commercial & Industrial Group
Segment Reporting Information [Line Items]
Total revenues									1,343.3
Snap-on Tools Group
Segment Reporting Information [Line Items]
Total revenues									1,613.8
Repair Systems & Information Group
Segment Reporting Information [Line Items]
Total revenues									1,334.4
Financial Services
Segment Reporting Information [Line Items]
Total revenues									329.7
Operating Segments
Segment Reporting Information [Line Items]
Operating earnings									1,036.2	1,014.0	946.5
Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Operating earnings									199.3	186.5	168.8
Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Operating earnings									264.2	274.7	280.4
Operating Segments | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Operating earnings									342.6	335.3	298.6
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Operating earnings									230.1	217.5	198.7
Intersegment eliminations
Segment Reporting Information [Line Items]
Total revenues									(550.8)
Corporate
Segment Reporting Information [Line Items]
Operating earnings									(80.1)	(131.9)	(85.4)
Product And Services, Excluding Financial Services
Segment Reporting Information [Line Items]
Total revenues	$ 952.5	$ 898.1	$ 954.6	$ 935.5	$ 974.6	$ 903.8	$ 921.4	$ 887.1	3,740.7	3,686.9	3,430.4
Operating earnings									726.0	664.6	662.4
Product And Services, Excluding Financial Services | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Total revenues									1,051.6
Product And Services, Excluding Financial Services | Snap-on Tools Group
Segment Reporting Information [Line Items]
Total revenues									1,613.8
Product And Services, Excluding Financial Services | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Total revenues									1,075.3
Product And Services, Excluding Financial Services | Financial Services
Segment Reporting Information [Line Items]
Total revenues									0.0
Product And Services, Excluding Financial Services | Operating Segments
Segment Reporting Information [Line Items]
Total revenues									4,291.5	4,237.3	3,962.1
Product And Services, Excluding Financial Services | Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Total revenues									1,343.3	1,265.0	1,148.3
Product And Services, Excluding Financial Services | Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Total revenues									1,613.8	1,625.1	1,633.9
Product And Services, Excluding Financial Services | Operating Segments | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Total revenues									1,334.4	1,347.2	1,179.9
Product And Services, Excluding Financial Services | Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Total revenues									0.0
Product And Services, Excluding Financial Services | Intersegment eliminations
Segment Reporting Information [Line Items]
Total revenues									(550.8)	(550.4)	(531.7)
Product And Services, Excluding Financial Services | Intersegment eliminations | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Total revenues									291.7
Product And Services, Excluding Financial Services | Intersegment eliminations | Snap-on Tools Group
Segment Reporting Information [Line Items]
Total revenues									0.0
Product And Services, Excluding Financial Services | Intersegment eliminations | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Total revenues									259.1
Product And Services, Excluding Financial Services | Intersegment eliminations | Financial Services
Segment Reporting Information [Line Items]
Total revenues									0.0
Financial Service
Segment Reporting Information [Line Items]
Total revenues	$ 82.7	$ 82.0	$ 82.0	$ 83.0	$ 79.9	$ 79.0	$ 77.7	$ 76.8	329.7	313.4	281.4
Operating earnings									230.1	$ 217.5	$ 198.7
Financial Service | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Total revenues									0.0
Financial Service | Snap-on Tools Group
Segment Reporting Information [Line Items]
Total revenues									0.0
Financial Service | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Total revenues									0.0
Financial Service | Financial Services
Segment Reporting Information [Line Items]
Total revenues									$ 329.7

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