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Postretirement Health Care Plans (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
(Amounts in millions)
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Interest cost
$
0.4

 
$
0.5

 
$
0.9

 
$
1.0

Expected return on plan assets
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Amortization of unrecognized gain
(0.1
)
 
—

 
(0.2
)
 
(0.1
)
Net periodic postretirement health care cost
$
0.1

 
$
0.3

 
$
0.3

 
$
0.5