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Segments - Assets by Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 5,256.2	$ 4,723.2
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	5,096.7	4,575.9
Operating Segments [Member] | Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Assets	1,104.0	907.1
Operating Segments [Member] | Snap-on Tools Group [Member]
Segment Reporting Information [Line Items]
Assets	734.9	668.1
Operating Segments [Member] | Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Assets	1,313.5	1,211.0
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Assets	1,944.3	1,789.7
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	224.2	212.3
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Assets	$ (64.7)	$ (65.0)

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

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+ References

No definition available.

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