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PENSION PLANS
 3 Months Ended
Apr. 03, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
PENSION PLANS
PENSION PLANS 
The components of net periodic pension cost consist of:
 
 
 
Three Months Ended
 
 
 
April 3,
2016
 
March 29,
2015
 
 
 
(in millions)
Service cost
 
 
$
12.8

 
$
15.1

Interest cost
 
 
20.4

 
19.0

Expected return on plan assets
 
 
(24.7
)
 
(22.1
)
Net amortization
 
 
2.3

 
1.2

Net periodic pension cost
 
 
$
10.8

 
$
13.2


In January 2016, we made a $125.0 million voluntary contribution to fund our qualified pension plans.