Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,182.1	$ 1,139.3	$ 3,486.3	$ 3,486.5
Net sales	1,291.9	1,247.4	3,816.2	3,809.2
Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	(147.7)	(141.9)	(417.3)	(412.8)
Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	367.7	365.7	1,059.4	1,097.6
Snap-on Tools Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	464.8	422.7	1,409.3	1,341.3
Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	101.1	100.4	304.9	300.5
Other revenues
Disaggregation of Revenue [Line Items]
Net sales	8.7	7.7	25.0	22.2
Product and Services, excluding Financial Services
Disaggregation of Revenue [Line Items]
Net sales	1,190.8	1,147.0	3,511.3	3,508.7
Product and Services, excluding Financial Services | External Sales
Disaggregation of Revenue [Line Items]
Net sales	1,190.8	1,147.0	3,511.3	3,508.7
Product and Services, excluding Financial Services | External Sales | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	912.5	878.4	2,706.6	2,685.4
Product and Services, excluding Financial Services | External Sales | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	278.3	268.6	804.7	823.3
Product and Services, excluding Financial Services | External Sales | North America
Disaggregation of Revenue [Line Items]
Net sales	889.7	863.1	2,621.8	2,622.2
Product and Services, excluding Financial Services | External Sales | Europe
Disaggregation of Revenue [Line Items]
Net sales	181.5	168.3	545.1	536.4
Product and Services, excluding Financial Services | External Sales | All other
Disaggregation of Revenue [Line Items]
Net sales	119.6	115.6	344.4	350.1
Product and Services, excluding Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	1,338.5	1,288.9	3,928.6	3,921.5
Product and Services, excluding Financial Services | Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	(147.7)	(141.9)	(417.3)	(412.8)
Product and Services, excluding Financial Services | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	297.8	288.7	863.7	884.7
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	367.7	365.7	1,059.4	1,097.6
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments | External Sales
Disaggregation of Revenue [Line Items]
Net sales	297.8	288.7	863.7	884.7
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments | External Sales | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	19.5	20.1	59.0	61.4
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments | External Sales | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	278.3	268.6	804.7	823.3
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments | External Sales | North America
Disaggregation of Revenue [Line Items]
Net sales	157.6	155.2	448.9	467.3
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments | External Sales | Europe
Disaggregation of Revenue [Line Items]
Net sales	76.9	72.2	232.0	230.0
Product and Services, excluding Financial Services | Commercial & Industrial Group | Operating Segments | External Sales | All other
Disaggregation of Revenue [Line Items]
Net sales	63.3	61.3	182.8	187.4
Product and Services, excluding Financial Services | Commercial & Industrial Group | Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	(69.9)	(77.0)	(195.7)	(212.9)
Product and Services, excluding Financial Services | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments | External Sales
Disaggregation of Revenue [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments | External Sales | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	506.0	500.5	1,459.9	1,482.6
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments | External Sales | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments | External Sales | North America
Disaggregation of Revenue [Line Items]
Net sales	435.3	434.0	1,255.8	1,280.7
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments | External Sales | Europe
Disaggregation of Revenue [Line Items]
Net sales	41.9	37.4	122.5	118.4
Product and Services, excluding Financial Services | Snap-on Tools Group | Operating Segments | External Sales | All other
Disaggregation of Revenue [Line Items]
Net sales	28.8	29.1	81.6	83.5
Product and Services, excluding Financial Services | Snap-on Tools Group | Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	387.0	357.8	1,187.7	1,141.4
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	464.8	422.7	1,409.3	1,341.3
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments | External Sales
Disaggregation of Revenue [Line Items]
Net sales	387.0	357.8	1,187.7	1,141.4
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments | External Sales | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	387.0	357.8	1,187.7	1,141.4
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments | External Sales | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments | External Sales | North America
Disaggregation of Revenue [Line Items]
Net sales	296.8	273.9	917.1	874.2
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments | External Sales | Europe
Disaggregation of Revenue [Line Items]
Net sales	62.7	58.7	190.6	188.0
Product and Services, excluding Financial Services | Repair Systems & Information Group | Operating Segments | External Sales | All other
Disaggregation of Revenue [Line Items]
Net sales	27.5	25.2	80.0	79.2
Product and Services, excluding Financial Services | Repair Systems & Information Group | Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	(77.8)	(64.9)	(221.6)	(199.9)
Product and Services, excluding Financial Services | Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Operating Segments | External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Operating Segments | External Sales | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Operating Segments | External Sales | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Operating Segments | External Sales | North America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Operating Segments | External Sales | Europe
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Operating Segments | External Sales | All other
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Product and Services, excluding Financial Services | Financial Services | Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial services revenue
Disaggregation of Revenue [Line Items]
Net sales	101.1	100.4	304.9	300.5
Financial services revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	101.1	100.4	304.9	300.5
Financial services revenue | Intersegment net sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial services revenue | Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial services revenue | Snap-on Tools Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial services revenue | Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial services revenue | Financial Services
Disaggregation of Revenue [Line Items]
Net sales	101.1	100.4	304.9	300.5
Financial services revenue | Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	$ 101.1	$ 100.4	$ 304.9	$ 300.5