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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2017
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 March 31,
 
 
Pension Benefits
 
Other Benefits
(Dollars in millions)
 
2017
 
2016
 
2017
 
2016
Service cost – benefits earned during the period
 
$
0.9

 
$
0.7

 
$
0.3

 
$
0.3

Interest cost on projected benefit obligations
 
2.7

 
3.0

 
0.4

 
0.4

Expected return on plan assets
 
(4.0
)
 
(4.1
)
 
—

 
—

  Net periodic benefit cost
 
$
(0.4
)
 
$
(0.4
)
 
$
0.7

 
$
0.7

Net actuarial (gains)/losses
 
—

 
6.1

 
—

 
—

Total net periodic expense/(benefit)
 
$
(0.4
)
 
$
5.7

 
$
0.7

 
$
0.7