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Pension Plans - (Tables)
 6 Months Ended
Jun. 29, 2019
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 29, 2019
 
June 30, 2018
 
June 29, 2019
 
June 30, 2018
Service cost
$
5.8

 
$
6.1

 
$
11.8

 
$
12.6

Interest cost
14.1

 
13.2

 
28.2

 
26.4

Expected return on plan assets
(23.1
)
 
(22.2
)
 
(45.5
)
 
(43.9
)
Amortization of unrecognized loss
6.3

 
8.4

 
12.5

 
16.4

Amortization of prior service credit
(0.2
)
 
(0.3
)
 
(0.4
)
 
(0.6
)
Net periodic pension cost
$
2.9

 
$
5.2

 
$
6.6

 
$
10.9