Revenue Recognition - Revenue Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 945.8	$ 949.2	$ 1,862.2	$ 1,879.6
Net sales	1,035.4	1,036.6	2,042.7	2,055.1
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	(138.4)	(138.2)	(277.3)	(276.0)
Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	1,089.7	1,092.8	2,150.3	2,166.1
Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	335.0	337.8	657.5	669.4
Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	335.0	337.8	657.5	669.4
Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	405.8	411.9	816.0	816.6
Snap-on Tools Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	405.8	411.9	816.0	816.6
Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	348.9	343.1	676.8	680.1
Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	348.9	343.1	676.8	680.1
Financial Services
Disaggregation of Revenue [Line Items]
Net sales	84.1	82.0	169.7	165.0
Other revenues
Disaggregation of Revenue [Line Items]
Net sales	5.5	5.4	10.8	10.5
Excluding Financial Services
Disaggregation of Revenue [Line Items]
Net sales	951.3	954.6	1,873.0	1,890.1
Excluding Financial Services | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	712.3	713.1	1,404.5	1,412.3
Excluding Financial Services | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	239.0	241.5	468.5	477.8
Excluding Financial Services | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	(138.4)	(138.2)	(277.3)	(276.0)
Excluding Financial Services | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	951.3	954.6	1,873.0	1,890.1
Excluding Financial Services | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	263.0	267.1	512.5	525.9
Excluding Financial Services | Commercial & Industrial Group | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	24.0	25.6	44.0	48.1
Excluding Financial Services | Commercial & Industrial Group | All other professionals
Disaggregation of Revenue [Line Items]
Net sales	239.0	241.5	468.5	477.8
Excluding Financial Services | Commercial & Industrial Group | Intersegment eliminations
Disaggregation of Revenue [Line Items]
Net sales	72.0	70.7	145.0	143.5
Excluding Financial Services | Commercial & Industrial Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	335.0	337.8	657.5	669.4
Excluding Financial Services | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	405.8	411.9	816.0	816.6
Excluding Financial Services | Snap-on Tools Group | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	405.8	411.9	816.0	816.6
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	405.8	411.9	816.0	816.6
Excluding Financial Services | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	282.5	275.6	544.5	547.6
Excluding Financial Services | Repair Systems & Information Group | Vehicle service professionals
Disaggregation of Revenue [Line Items]
Net sales	282.5	275.6	544.5	547.6
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	66.4	67.5	132.3	132.5
Excluding Financial Services | Repair Systems & Information Group | Operating Segments
Disaggregation of Revenue [Line Items]
Net sales	348.9	343.1	676.8	680.1
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	674.0	653.9	1,319.6	1,285.6
Excluding Financial Services | North America | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	121.6	118.3	230.5	225.8
Excluding Financial Services | North America | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	350.1	346.2	701.7	685.1
Excluding Financial Services | North America | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	202.3	189.4	387.4	374.7
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	171.1	188.5	344.9	379.9
Excluding Financial Services | Europe | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	72.3	76.6	149.7	159.5
Excluding Financial Services | Europe | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	36.5	43.7	73.4	85.2
Excluding Financial Services | Europe | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	62.3	68.2	121.8	135.2
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	106.2	112.2	208.5	224.6
Excluding Financial Services | All other | Commercial & Industrial Group
Disaggregation of Revenue [Line Items]
Net sales	69.1	72.2	132.3	140.6
Excluding Financial Services | All other | Snap-on Tools Group
Disaggregation of Revenue [Line Items]
Net sales	19.2	22.0	40.9	46.3
Excluding Financial Services | All other | Repair Systems & Information Group
Disaggregation of Revenue [Line Items]
Net sales	17.9	18.0	35.3	37.7
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	84.1	82.0	169.7	165.0
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	$ 84.1	$ 82.0	$ 169.7	$ 165.0