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Postretirement Health Care Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Postemployment Benefits [Abstract]  
Net Periodic Postretirement Health Care Cost
Snap-on’s net periodic postretirement health care cost included the following components: 
 
Three Months Ended
 
(Amounts in millions)
March 31, 2018
 
April 1, 2017
 
Interest cost
$
0.5

 
$
0.5

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

 
$
0.2