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Pension Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net Periodic Pension Cost
Snap-on’s net periodic pension cost included the following components: 
 
Three Months Ended
 
(Amounts in millions)
March 31, 2018
 
April 1, 2017
 
Service cost
$
6.5

 
$
5.9

 
Interest cost
13.2

 
14.0

 
Expected return on plan assets
(21.7
)
 
(20.1
)
 
Amortization of unrecognized loss
8.0

 
6.9

 
Amortization of prior service credit
(0.3
)
 
(0.3
)
 
Net periodic pension cost
$
5.7

 
$
6.4