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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 895.5
Currency translation	45.6
Acquisitions and related adjustments	(17.1)
Ending Balance	924.0
Commercial & Industrial Group [Member]
Goodwill [Line Items]
Beginning Balance	242.4
Currency translation	29.1
Acquisitions and related adjustments	25.7
Ending Balance	297.2
Snap-on Tools Group [Member]
Goodwill [Line Items]
Beginning Balance	12.5
Ending Balance	12.5
Repair Systems & Information Group [Member]
Goodwill [Line Items]
Beginning Balance	640.6
Currency translation	16.5
Acquisitions and related adjustments	(42.8)
Ending Balance	$ 614.3

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- Definition

Goodwill acquired and related adjustment.

+ References

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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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 350
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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