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Segments - Assets by Segment (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 5,272.0 | $ 5,249.1
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Assets | 5,111.5 | 5,114.3
Operating Segments | Commercial & Industrial Group |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,087.4 | 1,113.9
Operating Segments | Snap-on Tools Group |  |
Segment Reporting Information [Line Items] |  |
Assets | 746.7 | 714.3
Operating Segments | Repair Systems & Information Group |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,289.0 | 1,314.3
Operating Segments | Financial Services |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,988.4 | 1,971.8
Corporate |  |
Segment Reporting Information [Line Items] |  |
Assets | 225.1 | 200.6
Elimination of intersegment receivables |  |
Segment Reporting Information [Line Items] |  |
Assets | $ (64.6) | $ (65.8)

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