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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 28, 2019
Commitments and Contingencies Disclosure [Abstract]  
Summary of Product Warranty Accrual Activity Snap-on’s product warranty accrual activity for 2019, 2018 and 2017 is as follows:
(Amounts in millions)201920182017
Warranty accrual:
Beginning of year$17.1  $17.2  $16.0  
Additions16.0  14.9  15.2  
Usage(15.8) (15.0) (14.0) 
End of year$17.3  $17.1  $17.2