Segments - Schedule of Net Sales by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Segment Reporting Information [Line Items]
Net sales	$ 1,291.9	$ 1,247.4	$ 3,816.2	$ 3,809.2
Segment operating earnings	347.4	324.1	988.1	1,013.8
Interest expense	(12.4)	(12.5)	(37.1)	(37.3)
Other income (expense) – net	14.3	20.6	43.0	57.4
Earnings before income taxes	349.3	332.2	994.0	1,033.9
Proceeds from legal settlements	22.0		22.0	22.5
Repair Systems & Information Group
Segment Reporting Information [Line Items]
Proceeds from legal settlements	22.0		22.0
Product and Services, excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	1,190.8	1,147.0	3,511.3	3,508.7
Segment cost of goods sold	(584.9)	(559.2)	(1,731.4)	(1,726.9)
Gross profit	605.9	587.8	1,779.9	1,781.8
Total segment operating and financial services expenses	(327.4)	(335.4)	(999.2)	(978.2)
Segment operating earnings	278.5	252.4	780.7	803.6
Product and Services, excluding Financial Services | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	297.8	288.7	863.7	884.7
Product and Services, excluding Financial Services | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Product and Services, excluding Financial Services | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	387.0	357.8	1,187.7	1,141.4
Financial services revenue
Segment Reporting Information [Line Items]
Net sales	101.1	100.4	304.9	300.5
Total segment operating and financial services expenses	(32.2)	(28.7)	(97.5)	(90.3)
Segment operating earnings	68.9	71.7	207.4	210.2
Financial services revenue | Financial Services
Segment Reporting Information [Line Items]
Net sales	101.1	100.4	304.9	300.5
Intersegment net sales
Segment Reporting Information [Line Items]
Net sales	(147.7)	(141.9)	(417.3)	(412.8)
Intersegment net sales | Product and Services, excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	(147.7)	(141.9)	(417.3)	(412.8)
Segment cost of goods sold	147.7	141.9	417.3	412.8
Intersegment net sales | Product and Services, excluding Financial Services | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	(69.9)	(77.0)	(195.7)	(212.9)
Intersegment net sales | Product and Services, excluding Financial Services | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Intersegment net sales | Product and Services, excluding Financial Services | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	(77.8)	(64.9)	(221.6)	(199.9)
Intersegment net sales | Product and Services, excluding Financial Services | Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Intersegment net sales | Financial services revenue
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating and financial services expenses	(329.5)	(339.9)	(1,017.7)	(1,019.3)
Segment operating earnings	377.5	348.3	1,067.1	1,063.0
Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	367.7	365.7	1,059.4	1,097.6
Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Operating Segments | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	464.8	422.7	1,409.3	1,341.3
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Net sales	101.1	100.4	304.9	300.5
Operating Segments | Product and Services, excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	1,338.5	1,288.9	3,928.6	3,921.5
Segment cost of goods sold	(732.6)	(701.1)	(2,148.7)	(2,139.7)
Gross profit	605.9	587.8	1,779.9	1,781.8
Operating Segments | Product and Services, excluding Financial Services | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	367.7	365.7	1,059.4	1,097.6
Segment cost of goods sold	(217.2)	(214.9)	(623.2)	(644.8)
Gross profit	150.5	150.8	436.2	452.8
Personnel	(54.7)	(53.8)	(166.4)	(163.5)
Shipping and handling costs	(7.5)	(7.0)	(22.6)	(20.5)
Depreciation and amortization	(1.5)	(1.8)	(4.9)	(5.9)
Provisions for credit losses	0.0	0.0	0.0	0.0
Other segment expenses	(29.3)	(27.2)	(84.7)	(84.3)
Total segment operating and financial services expenses	(93.0)	(89.8)	(278.6)	(274.2)
Segment operating earnings	57.5	61.0	157.6	178.6
Operating Segments | Product and Services, excluding Financial Services | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Segment cost of goods sold	(269.2)	(264.0)	(771.4)	(769.8)
Gross profit	236.8	236.5	688.5	712.8
Personnel	(48.4)	(49.1)	(143.6)	(144.2)
Shipping and handling costs	(19.4)	(21.9)	(57.8)	(66.1)
Depreciation and amortization	(1.9)	(1.9)	(5.6)	(5.6)
Provisions for credit losses	0.0	0.0	0.0	0.0
Other segment expenses	(57.2)	(55.3)	(162.5)	(156.5)
Total segment operating and financial services expenses	(126.9)	(128.2)	(369.5)	(372.4)
Segment operating earnings	109.9	108.3	319.0	340.4
Operating Segments | Product and Services, excluding Financial Services | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	464.8	422.7	1,409.3	1,341.3
Segment cost of goods sold	(246.2)	(222.2)	(754.1)	(725.1)
Gross profit	218.6	200.5	655.2	616.2
Personnel	(65.7)	(62.4)	(195.7)	(189.7)
Shipping and handling costs	0.0	0.0	0.0	0.0
Depreciation and amortization	(4.9)	(5.4)	(13.9)	(16.0)
Provisions for credit losses	0.0	0.0	0.0	0.0
Other segment expenses	(6.8)	(25.4)	(62.5)	(76.7)
Total segment operating and financial services expenses	(77.4)	(93.2)	(272.1)	(282.4)
Segment operating earnings	141.2	107.3	383.1	333.8
Operating Segments | Product and Services, excluding Financial Services | Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments | Financial services revenue
Segment Reporting Information [Line Items]
Net sales	101.1	100.4	304.9	300.5
Operating Segments | Financial services revenue | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments | Financial services revenue | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments | Financial services revenue | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments | Financial services revenue | Financial Services
Segment Reporting Information [Line Items]
Net sales	101.1	100.4	304.9	300.5
Personnel	(9.1)	(9.0)	(27.0)	(26.2)
Shipping and handling costs	0.0	0.0	0.0	0.0
Depreciation and amortization	(0.2)	(0.2)	(0.6)	(0.7)
Provisions for credit losses	(18.4)	(15.9)	(56.5)	(52.2)
Other segment expenses	(4.5)	(3.6)	(13.4)	(11.2)
Total segment operating and financial services expenses	(32.2)	(28.7)	(97.5)	(90.3)
Segment operating earnings	68.9	71.7	207.4	210.2
Corporate operating expenses
Segment Reporting Information [Line Items]
Segment operating earnings	$ (30.1)	$ (24.2)	$ (79.0)	$ (49.2)