Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Segment Reporting Information [Line Items]
Net sales	$ 1,281.1	$ 1,279.9	$ 2,524.3	$ 2,561.8
Segment operating earnings	327.3	350.5	640.7	689.7
Interest expense	(12.3)	(12.3)	(24.7)	(24.8)
Other income (expense) – net	14.3	18.7	28.7	36.8
Earnings before income taxes	329.3	356.9	644.7	701.7
Total net sales
Segment Reporting Information [Line Items]
Net sales	1,179.4	1,179.4	2,320.5	2,361.7
Segment cost of goods sold	(583.9)	(582.1)	(1,146.5)	(1,167.7)
Gross profit	595.5	597.3	1,174.0	1,194.0
Total segment operating and financial services expenses	(336.4)	(317.0)	(671.8)	(642.8)
Segment operating earnings	259.1	280.3	502.2	551.2
Total net sales \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	289.2	305.0	565.9	596.0
Total net sales \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	491.0	482.0	953.9	982.1
Total net sales \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	399.2	392.4	800.7	783.6
Financial services revenue
Segment Reporting Information [Line Items]
Net sales	101.7	100.5	203.8	200.1
Total segment operating and financial services expenses	(33.5)	(30.3)	(65.3)	(61.6)
Segment operating earnings	68.2	70.2	138.5	138.5
Financial services revenue \| Financial Services
Segment Reporting Information [Line Items]
Net sales	101.7	100.5	203.8	200.1
Intersegment net sales
Segment Reporting Information [Line Items]
Net sales	(128.0)	(129.4)	(269.6)	(270.9)
Intersegment net sales \| Total net sales
Segment Reporting Information [Line Items]
Net sales	(128.0)	(129.4)	(269.6)	(270.9)
Segment cost of goods sold	128.0	129.4	269.6	270.9
Intersegment net sales \| Total net sales \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	(58.6)	(67.0)	(125.8)	(135.9)
Intersegment net sales \| Total net sales \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Intersegment net sales \| Total net sales \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	(69.4)	(62.4)	(143.8)	(135.0)
Intersegment net sales \| Total net sales \| Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Intersegment net sales \| Financial services revenue
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating and financial services expenses	(345.6)	(337.0)	(688.2)	(679.4)
Segment operating earnings	351.6	360.8	689.6	714.7
Operating Segments \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	347.8	372.0	691.7	731.9
Operating Segments \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	491.0	482.0	953.9	982.1
Operating Segments \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	468.6	454.8	944.5	918.6
Operating Segments \| Financial Services
Segment Reporting Information [Line Items]
Net sales	101.7	100.5	203.8	200.1
Operating Segments \| Total net sales
Segment Reporting Information [Line Items]
Net sales	1,307.4	1,308.8	2,590.1	2,632.6
Segment cost of goods sold	(711.9)	(711.5)	(1,416.1)	(1,438.6)
Gross profit	595.5	597.3	1,174.0	1,194.0
Operating Segments \| Total net sales \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	347.8	372.0	691.7	731.9
Segment cost of goods sold	(208.6)	(216.7)	(406.0)	(429.9)
Gross profit	139.2	155.3	285.7	302.0
Personnel	(55.8)	(54.6)	(111.7)	(109.7)
Shipping and handling costs	(7.6)	(7.4)	(15.1)	(13.5)
Depreciation and amortization	(1.6)	(2.0)	(3.4)	(4.1)
Provisions for credit losses	0.0	0.0	0.0	0.0
Other segment expenses	(27.3)	(29.1)	(55.4)	(57.1)
Total segment operating and financial services expenses	(92.3)	(93.1)	(185.6)	(184.4)
Segment operating earnings	46.9	62.2	100.1	117.6
Operating Segments \| Total net sales \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	491.0	482.0	953.9	982.1
Segment cost of goods sold	(253.8)	(246.8)	(502.2)	(505.8)
Gross profit	237.2	235.2	451.7	476.3
Personnel	(46.8)	(45.9)	(95.2)	(95.1)
Shipping and handling costs	(19.9)	(21.6)	(38.4)	(44.2)
Depreciation and amortization	(1.9)	(1.8)	(3.7)	(3.7)
Provisions for credit losses	0.0	0.0	0.0	0.0
Other segment expenses	(51.9)	(51.1)	(105.3)	(101.2)
Total segment operating and financial services expenses	(120.5)	(120.4)	(242.6)	(244.2)
Segment operating earnings	116.7	114.8	209.1	232.1
Operating Segments \| Total net sales \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	468.6	454.8	944.5	918.6
Segment cost of goods sold	(249.5)	(248.0)	(507.9)	(502.9)
Gross profit	219.1	206.8	436.6	415.7
Personnel	(64.9)	(63.1)	(130.0)	(127.3)
Shipping and handling costs	0.0	0.0	0.0	0.0
Depreciation and amortization	(4.5)	(5.2)	(9.0)	(10.6)
Provisions for credit losses	0.0	0.0	0.0	0.0
Other segment expenses	(29.9)	(24.9)	(55.7)	(51.3)
Total segment operating and financial services expenses	(99.3)	(93.2)	(194.7)	(189.2)
Segment operating earnings	119.8	113.6	241.9	226.5
Operating Segments \| Total net sales \| Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments \| Financial services revenue
Segment Reporting Information [Line Items]
Net sales	101.7	100.5	203.8	200.1
Operating Segments \| Financial services revenue \| Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments \| Financial services revenue \| Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments \| Financial services revenue \| Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Operating Segments \| Financial services revenue \| Financial Services
Segment Reporting Information [Line Items]
Net sales	101.7	100.5	203.8	200.1
Personnel	(9.1)	(8.5)	(17.9)	(17.2)
Shipping and handling costs	0.0	0.0	0.0	0.0
Depreciation and amortization	(0.2)	(0.2)	(0.4)	(0.5)
Provisions for credit losses	(19.0)	(17.5)	(38.1)	(36.3)
Other segment expenses	(5.2)	(4.1)	(8.9)	(7.6)
Total segment operating and financial services expenses	(33.5)	(30.3)	(65.3)	(61.6)
Segment operating earnings	68.2	70.2	138.5	138.5
Corporate
Segment Reporting Information [Line Items]
Segment operating earnings	$ (24.3)	$ (10.3)	$ (48.9)	$ (25.0)

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