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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS
    PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS
 
The net periodic benefit cost of the Company’s defined benefit pension and post-employment benefit plans includes: 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
(Dollars in millions)
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost – benefits earned during the period
 
$
0.7

 
$
0.7

 
$
0.2

 
$
0.3

 
$
1.4

 
$
1.5

 
$
0.5

 
$
0.6

Interest cost on projected benefit obligations
 
2.8

 
3.7

 
0.5

 
0.5

 
5.8

 
7.4

 
0.9

 
1.0

Expected return on plan assets
 
(4.1
)
 
(3.4
)
 
—

 
—

 
(8.2
)
 
(6.9
)
 
—

 
—

  Net periodic benefit cost
 
$
(0.6
)
 
$
1.0

 
$
0.7

 
$
0.8

 
$
(1.0
)
 
$
2.0

 
$
1.4

 
$
1.6

Net actuarial (gains)/losses
 
13.1

 
(1.5
)
 
—

 
—

 
19.2

 
(1.5
)
 
—

 
—

Total net periodic expense/(benefit)
 
$
12.5

 
$
(0.5
)
 
$
0.7

 
$
0.8

 
$
18.2

 
$
0.5

 
$
1.4

 
$
1.6


 
The Company remeasures its U.S. pension plan when year-to-date aggregate lump sum settlements exceed anticipated interest costs for the year, and in each subsequent quarter of that fiscal year. Because aggregate lump sum settlements exceeded anticipated annual interest costs for the respective year during the first quarter of 2016 and the second quarter of 2015, the Company remeasured its U.S. pension plan during the second quarter of both 2016 and 2015. During the three and six months ended June 30, 2016, the Company recognized a net actuarial loss of $13.1 million and $19.2 million, respectively. The pension remeasurement loss was driven by decreases in the discount rate associated with the U.S. pension plan liability. During the three and six months ended June 30, 2015 the Company recognized a net actuarial gain of $1.5 million.

During the six months ended June 30, 2016 and 2015, the Company contributed $1.9 million and $2.5 million, respectively, primarily to U.S. pension plans.