Segments - Schedule of Net Sales by Segment (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 04, 2026	Mar. 29, 2025
Segment Reporting Information [Line Items]
Net sales	$ 1,308.3	$ 1,243.2
Segment operating earnings	318.8	313.4
Interest expense	(12.4)	(12.4)
Other income (expense) – net	16.8	14.4
Earnings before income taxes	323.2	315.4
Product and Services, excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	1,207.2	1,141.1
Segment cost of goods sold	(598.9)	(562.6)
Gross profit	608.3	578.5
Total segment operating and financial services expenses	(357.5)	(335.4)
Segment operating earnings	250.8	243.1
Product and Services, excluding Financial Services \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	308.8	276.7
Product and Services, excluding Financial Services \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	486.0	462.9
Product and Services, excluding Financial Services \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	412.4	401.5
Financial services revenue
Segment Reporting Information [Line Items]
Net sales	101.1	102.1
Total segment operating and financial services expenses	(33.1)	(31.8)
Segment operating earnings	68.0	70.3
Financial services revenue \| Financial Services
Segment Reporting Information [Line Items]
Net sales	101.1	102.1
Intersegment Eliminations and Net Sales
Segment Reporting Information [Line Items]
Net sales	(145.1)	(141.6)
Intersegment Eliminations and Net Sales \| Product and Services, excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	(145.1)	(141.6)
Segment cost of goods sold	145.1	141.6
Intersegment Eliminations and Net Sales \| Product and Services, excluding Financial Services \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	(72.2)	(67.2)
Intersegment Eliminations and Net Sales \| Product and Services, excluding Financial Services \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Intersegment Eliminations and Net Sales \| Product and Services, excluding Financial Services \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	(72.9)	(74.4)
Intersegment Eliminations and Net Sales \| Product and Services, excluding Financial Services \| Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Intersegment Eliminations and Net Sales \| Financial services revenue
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating and financial services expenses	(362.0)	(342.6)
Segment operating earnings	347.4	338.0
Operating Segments \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	381.0	343.9
Operating Segments \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	486.0	462.9
Operating Segments \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	485.3	475.9
Operating Segments \| Financial Services
Segment Reporting Information [Line Items]
Net sales	101.1	102.1
Operating Segments \| Product and Services, excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	1,352.3	1,282.7
Segment cost of goods sold	(744.0)	(704.2)
Gross profit	608.3	578.5
Operating Segments \| Product and Services, excluding Financial Services \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	381.0	343.9
Segment cost of goods sold	(227.4)	(197.4)
Gross profit	153.6	146.5
Personnel	(59.5)	(55.9)
Shipping and handling costs	(7.7)	(7.5)
Depreciation and amortization	(1.7)	(1.8)
Provisions for credit losses	0.0	0.0
Other segment expenses	(29.8)	(28.1)
Total segment operating and financial services expenses	(98.7)	(93.3)
Segment operating earnings	54.9	53.2
Operating Segments \| Product and Services, excluding Financial Services \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	486.0	462.9
Segment cost of goods sold	(254.4)	(248.4)
Gross profit	231.6	214.5
Personnel	(51.8)	(48.4)
Shipping and handling costs	(19.8)	(18.5)
Depreciation and amortization	(1.9)	(1.8)
Provisions for credit losses	0.0	0.0
Other segment expenses	(53.1)	(53.4)
Total segment operating and financial services expenses	(126.6)	(122.1)
Segment operating earnings	105.0	92.4
Operating Segments \| Product and Services, excluding Financial Services \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	485.3	475.9
Segment cost of goods sold	(262.2)	(258.4)
Gross profit	223.1	217.5
Personnel	(69.0)	(65.1)
Shipping and handling costs	0.0	0.0
Depreciation and amortization	(4.7)	(4.5)
Provisions for credit losses	0.0	0.0
Other segment expenses	(29.9)	(25.8)
Total segment operating and financial services expenses	(103.6)	(95.4)
Segment operating earnings	119.5	122.1
Operating Segments \| Product and Services, excluding Financial Services \| Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Operating Segments \| Financial services revenue
Segment Reporting Information [Line Items]
Net sales	101.1	102.1
Operating Segments \| Financial services revenue \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Operating Segments \| Financial services revenue \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Operating Segments \| Financial services revenue \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Operating Segments \| Financial services revenue \| Financial Services
Segment Reporting Information [Line Items]
Net sales	101.1	102.1
Personnel	(9.5)	(8.8)
Shipping and handling costs	0.0	0.0
Depreciation and amortization	(0.2)	(0.2)
Provisions for credit losses	(18.8)	(19.1)
Other segment expenses	(4.6)	(3.7)
Total segment operating and financial services expenses	(33.1)	(31.8)
Segment operating earnings	68.0	70.3
Corporate operating expenses
Segment Reporting Information [Line Items]
Segment operating earnings	$ (28.6)	$ (24.6)

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