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Pensions and Postretirement Benefits
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Pensions and Postretirement Benefits
Pensions and Postretirement Benefits
The components of net periodic benefit cost for the Company’s U.S. and foreign defined benefit pension and other postretirement plans for the quarters and six months ended June 30, 2016 and 2015, are as follows:
 
Quarters Ended June 30,
 
Six Months Ended June 30,
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Service cost
$
0.9

 
$
1.6

 
$
0.1

 
$
0.1

 
$
2.2

 
$
3.2

 
$
0.2

 
$
0.2

Interest cost
3.2

 
3.1

 
0.1

 
—

 
6.3

 
6.1

 
0.2

 
0.1

Expected return on plan assets
(4.0
)
 
(4.7
)
 
—

 
—

 
(8.4
)
 
(9.4
)
 
—

 
—

Amortization of net loss
1.7

 
1.7

 
—

 
—

 
3.4

 
3.6

 
—

 
—

Deconsolidation of GST
(0.4
)
 
(0.2
)
 
—

 
—

 
(0.5
)
 
(0.4
)
 
—

 
—

Net periodic benefit cost
$
1.4

 
$
1.5

 
$
0.2

 
$
0.1

 
$
3.0

 
$
3.1

 
$
0.4

 
$
0.3


    
Based on currently available data, which is subject to change, we have estimated we will contribute approximately $14 million to our U.S. defined benefit pension plans in the year ending December 31, 2016, which we anticipate contributing in the third quarter.