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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS
Net periodic benefit expense (income) for our pension and postretirement plans include the following components:

Domestic Pension Plans
 
Three months ended
 
March 31,
2018
 
April 1,
2017
Service cost
$
—

 
$
0.1

Interest cost
3.1

 
3.3

Expected return on plan assets
(2.6
)
 
(2.5
)
Net periodic pension benefit expense
$
0.5

 
$
0.9



Foreign Pension Plans
 
Three months ended
 
March 31,
2018
 
April 1,
2017
Service cost
$
—

 
$
—

Interest cost
1.2

 
1.2

Expected return on plan assets
(1.9
)
 
(1.5
)
Net periodic pension benefit income
$
(0.7
)
 
$
(0.3
)


Postretirement Plans
 
Three months ended
 
March 31,
2018
 
April 1,
2017
Service cost
$
—

 
$
—

Interest cost
0.5

 
1.0

Amortization of unrecognized prior service credits
(1.0
)
 
(0.2
)
Net periodic postretirement benefit income
$
(0.5
)
 
$
0.8