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Commitments and Contingencies (Tables)
 6 Months Ended
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