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EMPLOYEE BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of changes in benefit obligations, plan assets, funded status and amounts recognized in the balance sheet
Changes in benefit obligations, plan assets, funded status and amounts recognized in the balance sheet were as follows:
  
Pension Benefits
 
Other Benefits
(Dollars in millions)
2015
 
2014
 
2015
 
2014
Beginning benefit obligations
$
388.9

 
$
404.0

 
$
51.6

 
$
32.6

Service cost—benefits earned during the year
2.9

 
4.8

 
1.3

 
0.9

Interest cost on projected benefit obligations
13.0

 
15.8

 
2.0

 
1.5

Actuarial assumptions (gains)/losses
(3.0
)
 
44.9

 
(5.5
)
 
17.2

Settlements and curtailments
(25.9
)
 
(74.2
)
 
—

 
—

Benefits paid
(4.7
)
 
(2.8
)
 
(0.5
)
 
(0.4
)
Exchange rate changes
(4.6
)
 
(3.6
)
 
(0.3
)
 
(0.2
)
Benefit obligations at end of year
$
366.6

 
$
388.9

 
$
48.6

 
$
51.6

 
 
 
 
 
 
 
 
Beginning fair value of plan assets
$
231.1

 
$
276.1

 
$
—

 
$
—

Actual return on plan assets
(2.1
)
 
20.7

 
—

 
—

Employer contributions
89.6

 
4.8

 
0.5

 
0.4

Settlements
(25.9
)
 
(65.1
)
 
—

 
—

Benefits paid
(4.7
)
 
(2.8
)
 
(0.5
)
 
(0.4
)
Exchange rate changes
(3.5
)
 
(2.6
)
 
—

 
—

Fair value of plan assets at end of year
$
284.5

 
$
231.1

 
$
—

 
$
—

Underfunded status at end of year
$
(82.1
)
 
$
(157.8
)
 
$
(48.6
)
 
$
(51.6
)
 
 
 
 
 
 
 
 
Amounts in the consolidated balance sheets include:
 
 
 
 
 
 
 
Other assets
$
3.3

 
$
1.7

 
$
—

 
$
—

Current liabilities
(1.6
)
 
—

 
—

 
—

Pension and other post-employment liabilities
(83.8
)
 
(159.5
)
 
(48.6
)
 
(51.6
)
Balance in the consolidated balance sheet at end of year
$
(82.1
)
 
$
(157.8
)
 
$
(48.6
)
 
$
(51.6
)
 
 
 
 
 
 
 
 
Amounts in accumulated other comprehensive loss include:
 
 
 
 
 
 
 
Prior service/(benefit) and Transition Obligation
0.9

 
0.9

 
(0.1
)
 
(0.2
)
Balance in accumulated other comprehensive loss at end of year
$
0.9

 
$
0.9

 
$
(0.1
)
 
$
(0.2
)
 
 
 
 
 
 
 
 
Accumulated benefit obligation
$
354.9

 
$
353.4

 
$
48.6

 
$
51.6
Schedule of accumulated benefit obligation in excess of plan assets
The Company’s defined benefit pension and other post-employment benefit plans with an accumulated benefit obligation in excess of plan assets were as follows:
 
 
Years Ended
December 31,
(Dollars in millions) 
2015
 
2014
Projected benefit obligation
$
386.8

 
$
409.0

Accumulated benefit obligation
383.2

 
405.0

Fair value of plan assets
253.1

 
197.1
Schedule of net periodic benefit cost
The net periodic benefit cost of the Company’s defined benefit pension and other post-employment benefit plans includes:
  
Pension Benefits
 
Other Benefits
 
 
Years Ended
December 31,
 
Years Ended
December 31,
(Dollars in millions) 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Service cost — benefits earned during the period
$
2.9

 
$
4.8

 
$
5.2

 
$
1.3

 
$
0.9

 
$
1.1

Interest cost on projected benefit obligations
13.0

 
15.8

 
14.4

 
2.0

 
1.5

 
1.3

Expected return on pension plan assets
(14.7
)
 
(15.7
)
 
(17.1
)
 
—

 
—

 
—

Amortization of prior service/(benefit)
—

 
—

 
—

 
—

 
0.2

 
(0.2
)
Amortization of transition cost
0.1

 
0.1

 
0.1

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
Sub-total
$
1.3

 
$
5.0

 
$
2.6

 
$
3.3

 
$
2.6

 
$
2.2

Curtailments
—

 
(5.4
)
 
—

 
—

 
—

 
—

Net actuarial (gains)/losses
13.7

 
39.7

 
(8.2
)
 
(5.5
)
 
17.2

 
(3.8
)
Total Pension and Other Post-Employment Benefit costs
$
15.0

 
$
39.3

 
$
(5.6
)
 
$
(2.2
)
 
$
19.8

 
$
(1.6
)
Schedule of weighted-average assumptions used to determine benefit obligations and net periodic benefit cost
Weighted-average assumptions used to determine net periodic benefit cost are established at the beginning of the plan year and were as follows:
  
Pension Benefits
 
Other Benefits
 
Years Ended December 31,
 
Years Ended December 31,
  
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Discount rate
3.98
%
 
4.08
%
 
3.26
%
 
4.08
%
 
4.98
%
 
3.75
%
Expected long-term return on plan assets
6.25
%
 
6.16
%
 
5.22
%
 
—
%
 
—
%
 
—
%
Rate of compensation increase
3.24
%
 
3.22
%
 
3.59
%
 
2.83
%
 
3.08
%
 
3.48
%
Weighted-average assumptions used to determine benefit obligations are established as of the balance sheet date and were as follows:
  
Pension Benefits
 
Other Benefits
  
December 31,
 
December 31,
  
2015
 
2014
 
2015
 
2014
Discount rate
4.32
%
 
3.98
%
 
4.47
%
 
4.08
%
Rate of compensation increase
6.09
%
 
3.24
%
 
4.00
%
 
3.06
%
Schedule of assumed health care cost trend rates
Assumed health care cost trend rates were as follows:
  
December 31,
  
2015
 
2014
 
2013
Health care cost trend rate assumed for next year
7.6
%
 
6.7
%
 
6.9
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
4.5
%
 
4.5
%
 
4.9
%
Year that the rate reaches the ultimate trend rate
2024

 
2024

 
2023
Schedule of effect of one-percentage-point change in assumed health care cost trend rates
A one-percentage-point change in assumed health care cost trend rates would have the following effects:
(Dollars in millions) 
1-Percentage-Point
Increase
 
1-Percentage-Point
Decrease
Effect on total of service and interest cost
$
—

 
$
—

Increase/(decrease) in post-employment benefit obligation
0.5

 
(0.4
)
Schedule of fair values of the pension plan assets by asset category
The fair values of the Company’s pension plan assets by asset category were as follows:
  
December 31, 2015
 
December 31, 2014
(Dollars in millions) 
Total
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
Cash and cash equivalents
11.1

 
11.1

 
—

 
8.4

 
8.4

 
—

Equity securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. large-cap
38.1

 
—

 
38.1

 
37.2

 
—

 
37.2

U.S. small-cap growth
5.5

 
—

 
5.5

 
4.9

 
—

 
4.9

Emerging markets
14.3

 
—

 
14.3

 
12.7

 
—

 
12.7

Real estate investment trusts
6.8

 
—

 
6.8

 
6.1

 
—

 
6.1

International large-cap value
48.2

 
8.1

 
40.1

 
45.1

 
7.5

 
37.6

Hedge fund
12.7

 
—

 
12.7

 
15.5

 
—

 
15.5

Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
Government bonds
48.1

 
—

 
48.1

 
40.2

 
—

 
40.2

Corporate bonds
94.7

 
—

 
94.7

 
55.5

 
—

 
55.5

Emerging markets
5.0

 
—

 
5.0

 
5.5

 
—

 
5.5

Total
$
284.5

 
$
19.2

 
$
265.3

 
$
231.1

 
$
15.9

 
$
215.2
Schedule of estimated future benefit payments expected to be paid
The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:
(Dollars in millions) 
Pension
Benefits
 
Other
Benefits
2016
$
33.5

 
$
1.5

2017
29.6

 
2.0

2018
28.8

 
2.5

2019
28.9

 
2.9

2020
29.2

 
3.3

Years 2021 - 2025
138.0

 
19.0