Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,139.3	$ 1,152.2	$ 3,486.5	$ 3,513.3
Net sales	1,247.4	1,254.2	3,809.2	3,814.5
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	(141.9)	(154.3)	(412.8)	(466.7)
Commercial & Industrial Group \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	365.7	366.4	1,097.6	1,094.4
Snap-on Tools Group \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	500.5	515.4	1,482.6	1,575.5
Repair Systems & Information Group \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	422.7	431.8	1,341.3	1,330.4
Financial Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	100.4	94.9	300.5	280.9
Other revenues
Disaggregation of Revenue [Line Items]
Net sales	7.7	7.1	22.2	20.3
Total net sales
Disaggregation of Revenue [Line Items]
Net sales	1,147.0	1,159.3	3,508.7	3,533.6
Total net sales \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	1,147.0	1,159.3	3,508.7	3,533.6
Total net sales \| Vehicle service professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	878.4	898.2	2,685.4	2,746.9
Total net sales \| All other professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	268.6	261.1	823.3	786.7
Total net sales \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	1,288.9	1,313.6	3,921.5	4,000.3
Total net sales \| Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	(141.9)	(154.3)	(412.8)	(466.7)
Total net sales \| Commercial & Industrial Group \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	365.7	366.4	1,097.6	1,094.4
Total net sales \| Commercial & Industrial Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	288.7	280.5	884.7	848.9
Total net sales \| Commercial & Industrial Group \| Operating Segments \| Vehicle service professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	20.1	19.4	61.4	62.2
Total net sales \| Commercial & Industrial Group \| Operating Segments \| All other professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	268.6	261.1	823.3	786.7
Total net sales \| Commercial & Industrial Group \| Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	77.0	85.9	212.9	245.5
Total net sales \| Snap-on Tools Group \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	500.5	515.4	1,482.6	1,575.5
Total net sales \| Snap-on Tools Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	500.5	515.4	1,482.6	1,575.5
Total net sales \| Snap-on Tools Group \| Operating Segments \| Vehicle service professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	500.5	515.4	1,482.6	1,575.5
Total net sales \| Snap-on Tools Group \| Operating Segments \| All other professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Snap-on Tools Group \| Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Repair Systems & Information Group \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	422.7	431.8	1,341.3	1,330.4
Total net sales \| Repair Systems & Information Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	357.8	363.4	1,141.4	1,109.2
Total net sales \| Repair Systems & Information Group \| Operating Segments \| Vehicle service professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	357.8	363.4	1,141.4	1,109.2
Total net sales \| Repair Systems & Information Group \| Operating Segments \| All other professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Repair Systems & Information Group \| Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	64.9	68.4	199.9	221.2
Total net sales \| Financial Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Financial Services \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Financial Services \| Operating Segments \| Vehicle service professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Financial Services \| Operating Segments \| All other professionals \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Financial Services \| Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| North America \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	863.1	879.8	2,622.2	2,662.6
Total net sales \| North America \| Commercial & Industrial Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	155.2	146.4	467.3	428.3
Total net sales \| North America \| Snap-on Tools Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	434.0	451.4	1,280.7	1,384.6
Total net sales \| North America \| Repair Systems & Information Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	273.9	282.0	874.2	849.7
Total net sales \| North America \| Financial Services \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| Europe \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	168.3	161.1	536.4	513.1
Total net sales \| Europe \| Commercial & Industrial Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	72.2	69.6	230.0	220.1
Total net sales \| Europe \| Snap-on Tools Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	37.4	37.5	118.4	112.2
Total net sales \| Europe \| Repair Systems & Information Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	58.7	54.0	188.0	180.8
Total net sales \| Europe \| Financial Services \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Total net sales \| All other \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	115.6	118.4	350.1	357.9
Total net sales \| All other \| Commercial & Industrial Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	61.3	64.5	187.4	200.5
Total net sales \| All other \| Snap-on Tools Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	29.1	26.5	83.5	78.7
Total net sales \| All other \| Repair Systems & Information Group \| Operating Segments \| External Sales
Disaggregation of Revenue [Line Items]
Net sales	25.2	27.4	79.2	78.7
Total net sales \| All other \| Financial Services \| Operating Segments \| External 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	100.4	94.9	300.5	280.9
Financial services revenue \| Intersegment eliminations
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	100.4	94.9	300.5	280.9
Financial services revenue \| Financial Services \| Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	$ 100.4	$ 94.9	$ 300.5	$ 280.9