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Segments - Assets by Segment (Detail) - USD ($) $ in Millions	Jan. 02, 2021	Dec. 28, 2019
Segment Reporting Information [Line Items]
Assets	$ 6,557.3	$ 5,693.5
Operating Segments
Segment Reporting Information [Line Items]
Assets	5,555.7	5,452.1
Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Assets	1,210.4	1,138.8
Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Assets	775.3	827.4
Operating Segments | Repair Systems  & Information Group
Segment Reporting Information [Line Items]
Assets	1,399.7	1,381.9
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Assets	2,170.3	2,104.0
Corporate
Segment Reporting Information [Line Items]
Assets	1,063.2	303.1
Intersegment eliminations
Segment Reporting Information [Line Items]
Assets	$ (61.6)	$ (61.7)

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.

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