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Pension Plans (Tables)
 9 Months Ended
Sep. 29, 2018
Retirement Benefits [Abstract]  
Net Periodic Pension Cost
Snap-on’s net periodic pension 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
Service cost
$
6.3

 
$
5.6

 
$
18.9

 
$
16.8

Interest cost
13.2

 
13.9

 
39.6

 
41.8

Expected return on plan assets
(22.6
)
 
(21.2
)
 
(66.5
)
 
(62.2
)
Amortization of unrecognized loss
8.2

 
6.9

 
24.6

 
20.8

Amortization of prior service credit
(0.3
)
 
(0.2
)
 
(0.9
)
 
(0.8
)
Net periodic pension cost
$
4.8

 
$
5.0

 
$
15.7

 
$
16.4