Condensed Consolidated Statements of Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Income Statement [Abstract]
Net sales	$ 921.4	$ 872.3	$ 1,808.5	$ 1,706.5
Cost of goods sold	(458.4)	(441.0)	(897.5)	(859.9)
Gross profit	463.0	431.3	911.0	846.6
Operating expenses	(279.3)	(264.9)	(557.8)	(524.8)
Operating earnings before financial services	183.7	166.4	353.2	321.8
Financial services revenue	77.7	69.3	154.5	135.6
Financial services expenses	(23.1)	(19.8)	(47.4)	(39.1)
Operating earnings from financial services	54.6	49.5	107.1	96.5
Operating earnings	238.3	215.9	460.3	418.3
Interest expense	(13.0)	(12.9)	(25.7)	(26.0)
Other income (expense) - net	(1.9)	1.2	(3.6)	0.5
Earnings before income taxes and equity earnings	223.4	204.2	431.0	392.8
Income tax expense	(67.3)	(62.2)	(129.9)	(119.8)
Earnings before equity earnings	156.1	142.0	301.1	273.0
Equity earnings, net of tax	0.7	1.4	0.8	1.7
Net earnings	156.8	143.4	301.9	274.7
Net earnings attributable to noncontrolling interests	(3.6)	(3.3)	(7.1)	(6.3)
Net earnings attributable to Snap-on Incorporated	$ 153.2	$ 140.1	$ 294.8	$ 268.4
Net earnings per share attributable to Snap-on Incorporated:
Basic	$ 2.65	$ 2.41	$ 5.09	$ 4.62
Diluted	$ 2.60	$ 2.36	$ 4.98	$ 4.52
Weighted-average shares outstanding:
Basic	57.8	58.1	57.9	58.1
Effect of dilutive securities	1.2	1.3	1.3	1.3
Diluted	59.0	59.4	59.2	59.4
Dividends declared per common share	$ 0.71	$ 0.61	$ 1.42	$ 1.22