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Postretirement Health Care Plans (Tables)
 9 Months Ended
Sep. 29, 2018
Retirement Benefits [Abstract]  
Net Periodic Postretirement Health Care Cost
Snap-on’s net periodic postretirement health care cost included the following components: 
 
Three Months Ended
 
Nine Months Ended
(Amounts in millions)
September 29,
2018
 
September 30,
2017
 
September 29,
2018
 
September 30,
2017
Interest cost
$
0.5

 
$
0.5

 
$
1.4

 
$
1.5

Expected return on plan assets
(0.2
)
 
(0.2
)
 
(0.6
)
 
(0.6
)
Amortization of unrecognized gain
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.2
)
Net periodic postretirement health care cost
$
0.2

 
$
0.2

 
$
0.5

 
$
0.7