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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of net periodic benefit cost
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