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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 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
 
Six months ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Service cost
$
—

 
$
0.1

 
$
—

 
$
0.2

Interest cost
3.0

 
3.3

 
6.1

 
6.6

Expected return on plan assets
(2.6
)
 
(2.5
)
 
(5.2
)
 
(5.0
)
Net periodic pension benefit expense
$
0.4

 
$
0.9

 
$
0.9

 
$
1.8







Foreign Pension Plans
 
Three months ended
 
Six months ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
1.2

 
1.2

 
2.4

 
2.4

Expected return on plan assets
(1.9
)
 
(1.6
)
 
(3.8
)
 
(3.1
)
Net periodic pension benefit income
$
(0.7
)
 
$
(0.4
)
 
$
(1.4
)
 
$
(0.7
)


Postretirement Plans
 
Three months ended
 
Six months ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
0.6

 
0.9

 
1.1

 
1.9

Amortization of unrecognized prior service credits
(1.0
)
 
(0.2
)
 
(2.0
)
 
(0.4
)
Net periodic postretirement benefit (income) expense
$
(0.4
)
 
$
0.7

 
$
(0.9
)
 
$
1.5