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Pensions
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Pensions PENSIONS
The following table summarizes the components of net periodic pension expense (benefit): 
 
U.S. Benefit Plan
 
Non-U.S. Benefit Plan
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
0.1

 
$
0.1

Interest cost
1.7

 
1.6

 
3.4

 
3.2

 
0.4

 
0.4

 
0.7

 
0.7

Amortization of actuarial loss
0.6

 
0.7

 
1.2

 
1.5

 
0.1

 
0.1

 
0.3

 
0.3

Amortization of prior service cost
—

 
—

 
—

 
—

 
0.1

 
—

 
0.1

 
—

Expected return on plan assets
(2.2
)
 
(2.2
)
 
(4.4
)
 
(4.4
)
 
(0.5
)
 
(0.6
)
 
(1.0
)
 
(1.2
)
Net periodic pension expense (benefit)
$
0.1

 
$
0.1

 
$
0.2

 
$
0.3

 
$
0.1

 
$
(0.1
)
 
$
0.2

 
$
(0.1
)