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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Summary of Product Warranty Accrual Activity | Snap‑on’s product warranty accrual activity for the three and six months ended June 30, 2018, and July 1, 2017, is as follows:
| Three Months Ended |  | Six Months Ended
(Amounts in millions) | June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
Warranty reserve: |  |  |  |  |  |  |
Beginning of period | $ | 17.5 |  |  | $ | 17.1 |  |  | $ | 17.2 |  |  | $ | 16.0 |
Additions | 4.1 |  |  | 5.6 |  |  | 7.9 |  |  | 9.3 |
Usage | (4.1 | ) |  | (3.8 | ) |  | (7.6 | ) |  | (6.4 | )
End of period | $ | 17.5 |  |  | $ | 18.9 |  |  | $ | 17.5 |  |  | $ | 18.9 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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