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Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Net Periodic Pension Cost
Snap-on’s net periodic pension 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
Service cost
$
6.1

 
$
5.3

 
$
12.6

 
$
11.2

Interest cost
13.2

 
13.9

 
26.4

 
27.9

Expected return on plan assets
(22.2
)
 
(20.9
)
 
(43.9
)
 
(41.0
)
Amortization of unrecognized loss
8.4

 
7.0

 
16.4

 
13.9

Amortization of prior service credit
(0.3
)
 
(0.3
)
 
(0.6
)
 
(0.6
)
Net periodic pension cost
$
5.2

 
$
5.0

 
$
10.9

 
$
11.4