Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 718.4	$ 945.8	$ 1,565.0	$ 1,862.2
Net sales	808.9	1,035.4	1,747.0	2,042.7
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	(105.9)	(138.4)	(244.1)	(277.3)
Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	830.2	1,089.7	1,820.6	2,150.3
Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	261.9	335.0	561.8	657.5
Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	261.9	335.0	561.8	657.5
Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	323.3	405.8	699.2	816.0
Snap-on Tools Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	323.3	405.8	699.2	816.0
Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	245.0	348.9	559.6	676.8
Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	245.0	348.9	559.6	676.8
Financial Services
Disaggregation of Revenue [Line Items]
Net sales	84.6	84.1	170.5	169.7
Other revenues
Disaggregation of Revenue [Line Items]
Net sales	5.9	5.5	11.5	10.8
Excluding Financial Services
Disaggregation of Revenue [Line Items]
Net sales	724.3	951.3	1,576.5	1,873.0
Excluding Financial Services | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	539.8	712.3	1,184.4	1,404.5
Excluding Financial Services | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	184.5	239.0	392.1	468.5
Excluding Financial Services | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	(105.9)	(138.4)	(244.1)	(277.3)
Excluding Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	724.3	951.3	1,576.5	1,873.0
Excluding Financial Services | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	204.5	263.0	431.5	512.5
Excluding Financial Services | Commercial & Industrial Group | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	20.0	24.0	39.4	44.0
Excluding Financial Services | Commercial & Industrial Group | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	184.5	239.0	392.1	468.5
Excluding Financial Services | Commercial & Industrial Group | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	57.4	72.0	130.3	145.0
Excluding Financial Services | Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	261.9	335.0	561.8	657.5
Excluding Financial Services | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	323.3	405.8	699.2	816.0
Excluding Financial Services | Snap-on Tools Group | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	323.3	405.8	699.2	816.0
Excluding Financial Services | Snap-on Tools Group | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Snap-on Tools Group | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Snap-on Tools Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	323.3	405.8	699.2	816.0
Excluding Financial Services | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	196.5	282.5	445.8	544.5
Excluding Financial Services | Repair Systems & Information Group | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	196.5	282.5	445.8	544.5
Excluding Financial Services | Repair Systems & Information Group | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Repair Systems & Information Group | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	48.5	66.4	113.8	132.3
Excluding Financial Services | Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	245.0	348.9	559.6	676.8
Excluding Financial Services | Financial Services
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Financial Services | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Financial Services | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Financial Services | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | North America
Disaggregation of Revenue [Line Items]
Net sales	536.9	674.0	1,150.0	1,319.6
Excluding Financial Services | North America | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	96.9	121.6	205.8	230.5
Excluding Financial Services | North America | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	291.5	350.1	618.4	701.7
Excluding Financial Services | North America | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	148.5	202.3	325.8	387.4
Excluding Financial Services | North America | Financial Services
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | Europe
Disaggregation of Revenue [Line Items]
Net sales	109.3	171.1	264.1	344.9
Excluding Financial Services | Europe | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	54.9	72.3	122.0	149.7
Excluding Financial Services | Europe | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	17.5	36.5	48.6	73.4
Excluding Financial Services | Europe | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	36.9	62.3	93.5	121.8
Excluding Financial Services | Europe | Financial Services
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Excluding Financial Services | All other
Disaggregation of Revenue [Line Items]
Net sales	78.1	106.2	162.4	208.5
Excluding Financial Services | All other | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	52.7	69.1	103.7	132.3
Excluding Financial Services | All other | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	14.3	19.2	32.2	40.9
Excluding Financial Services | All other | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	11.1	17.9	26.5	35.3
Excluding Financial Services | All other | Financial Services
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial Service
Disaggregation of Revenue [Line Items]
Net sales	84.6	84.1	170.5	169.7
Financial Service | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial Service | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial Service | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial Service | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Financial Service | Financial Services
Disaggregation of Revenue [Line Items]
Net sales	$ 84.6	$ 84.1	$ 170.5	$ 169.7