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Segments - Assets by Segment (Detail) - USD ($) $ in Millions | Jul. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 5,067.1 | $ 4,723.2
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 4,926.0 | 4,575.9
Operating Segments [Member] | Commercial & Industrial Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,052.2 | 907.1
Operating Segments [Member] | Snap-on Tools Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 700.8 | 668.1
Operating Segments [Member] | Repair Systems & Information Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,286.4 | 1,211.0
Operating Segments [Member] | Financial Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,886.6 | 1,789.7
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 213.6 | 212.3
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ (72.5) | $ (65.0)

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