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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Beginning Balance	$ 895.5	$ 790.1
Currency translation	46.1	(25.9)
Acquisitions	(17.5)	131.3
Ending Balance	924.1	895.5
Commercial & Industrial Group [Member]
Goodwill [Line Items]
Beginning Balance	242.4	253.1
Currency translation	30.3	(16.4)
Acquisitions	25.7	5.7
Ending Balance	298.4	242.4
Snap-on Tools Group [Member]
Goodwill [Line Items]
Beginning Balance	12.5	12.5
Ending Balance	12.5	12.5
Repair Systems & Information Group [Member]
Goodwill [Line Items]
Beginning Balance	640.6	524.5
Currency translation	15.8	(9.5)
Acquisitions	(43.2)	125.6
Ending Balance	$ 613.2	$ 640.6

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Goodwill acquired and related adjustment.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Name Accounting Standards Codification
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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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