Condensed Consolidated Statements of Earnings (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Income Statement [Abstract]
Net sales	$ 935.5	$ 887.1
Cost of goods sold	(463.9)	(438.8)
Gross profit	471.6	448.3
Operating expenses	(293.9)	(278.1)
Operating earnings before financial services	177.7	170.2
Financial services revenue	83.0	76.8
Financial services expenses	(26.1)	(24.3)
Operating earnings from financial services	56.9	52.5
Operating earnings	234.6	222.7
Interest expense	(13.6)	(12.7)
Other income (expense) – net	2.8	(2.4)
Earnings before income taxes and equity earnings	223.8	207.6
Income tax expense	(57.6)	(62.6)
Earnings before equity earnings	166.2	145.0
Equity earnings, net of tax	0.6	0.1
Net earnings	166.8	145.1
Net earnings attributable to noncontrolling interests	(3.8)	(3.5)
Net earnings attributable to Snap-on Incorporated	$ 163.0	$ 141.6
Net earnings per share attributable to Snap-on Incorporated:
Basic (in dollars per share)	$ 2.87	$ 2.45
Diluted (in dollars per share)	$ 2.82	$ 2.39
Weighted-average shares outstanding:
Basic (in shares)	56,651,508	57,940,664
Effect of dilutive securities (in shares)	1,113,721	1,383,806
Diluted (in shares)	57,765,229	59,324,470
Dividends declared per common share (in dollars per share)	$ 0.82	$ 0.71