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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2016
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
  
Pension Benefits
 
Other Benefits
(Dollars in millions)
2016
 
2015
 
2016
 
2015
Beginning benefit obligations
$
366.6

 
$
388.9

 
$
48.6

 
$
51.6

Service cost—benefits earned during the year
2.8

 
2.9

 
1.1

 
1.3

Interest cost on projected benefit obligations
11.2

 
13.0

 
1.8

 
2.0

Actuarial assumptions (gains)/losses
(1.8
)
 
(3.0
)
 
(0.2
)
 
(5.5
)
Settlements and curtailments
(42.5
)
 
(25.9
)
 
—

 
—

Benefits paid
(3.9
)
 
(4.7
)
 
(0.1
)
 
(0.5
)
Exchange rate changes
(2.2
)
 
(4.6
)
 
0.1

 
(0.3
)
Benefit obligations at end of year
$
330.2

 
$
366.6

 
$
51.3

 
$
48.6

 
 
 
 
 
 
 
 
Beginning fair value of plan assets
$
284.5

 
$
231.1

 
$
—

 
$
—

Actual return on plan assets
22.5

 
(2.1
)
 
—

 
—

Employer contributions
19.2

 
89.6

 
0.1

 
0.5

Settlements
(42.5
)
 
(25.9
)
 
—

 
—

Benefits paid
(3.9
)
 
(4.7
)
 
(0.1
)
 
(0.5
)
Exchange rate changes
(0.8
)
 
(3.5
)
 
—

 
—

Fair value of plan assets at end of year
$
279.0

 
$
284.5

 
$
—

 
$
—

Underfunded status at end of year
$
(51.2
)
 
$
(82.1
)
 
$
(51.3
)
 
$
(48.6
)
 
 
 
 
 
 
 
 
Amounts in the consolidated balance sheets include:
 
 
 
 
 
 
 
Other assets
$
3.4

 
$
3.3

 
$
—

 
$
—

Current liabilities
(1.7
)
 
(1.6
)
 
—

 
—

Pension and other post-employment liabilities
(52.9
)
 
(83.8
)
 
(51.3
)
 
(48.6
)
Balance in the consolidated balance sheet at end of year
$
(51.2
)
 
$
(82.1
)
 
$
(51.3
)
 
$
(48.6
)
 
 
 
 
 
 
 
 
Amounts in accumulated other comprehensive loss include:
 
 
 
 
 
 
 
Prior service/(benefit) and Transition Obligation
0.9

 
0.9

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

 
$
0.9

 
$
(0.1
)
 
$
(0.1
)
 
 
 
 
 
 
 
 
Accumulated benefit obligation
$
320.2

 
$
354.9

 
$
51.3

 
$
48.6
Schedule of accumulated benefit obligation in excess of plan assets
 
 
Years Ended
December 31,
(Dollars in millions) 
2016
 
2015
Projected benefit obligation
$
352.3

 
$
386.8

Accumulated benefit obligation
349.3

 
383.2

Fair value of plan assets
246.5

 
253.1
Schedule of net periodic benefit cost
  
Pension Benefits
 
Other Benefits
 
 
Years Ended
December 31,
 
Years Ended
December 31,
(Dollars in millions) 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Service cost — benefits earned during the period
$
2.8

 
$
2.9

 
$
4.8

 
$
1.1

 
$
1.3

 
$
0.9

Interest cost on projected benefit obligations
11.2

 
13.0

 
15.8

 
1.8

 
2.0

 
1.5

Expected return on pension plan assets
(16.9
)
 
(14.7
)
 
(15.7
)
 
—

 
—

 
—

Amortization of prior service/(benefit)
0.1

 
—

 
—

 
(0.1
)
 
—

 
0.2

Amortization of transition cost
—

 
0.1

 
0.1

 
—

 
—

 
—

Net periodic benefit cost
$
(2.8
)
 
$
1.3

 
$
5.0

 
$
2.8

 
$
3.3

 
$
2.6

Curtailments
—

 
—

 
(5.4
)
 
—

 
—

 
—

Net actuarial (gains)/losses
(7.2
)
 
13.7

 
39.7

 
(0.2
)
 
(5.5
)
 
17.2

Total net periodic expense/(benefit)
$
(10.0
)
 
$
15.0

 
$
39.3

 
$
2.6

 
$
(2.2
)
 
$
19.8
Schedule of weighted-average assumptions used to determine benefit obligations and net periodic benefit cost
  
Pension Benefits
 
Other Benefits
  
December 31,
 
December 31,
  
2016
 
2015
 
2016
 
2015
Discount rate
4.11
%
 
4.32
%
 
4.19
%
 
4.47
%
Rate of compensation increase
5.70
%
 
6.09
%
 
4.00
%
 
4.00
%


The discount rate was determined based on the yield to maturity of high-quality corporate bonds and considering the duration of the pension plan obligations. The Aon Hewitt AA Above Median yield curve is used in developing the discount rate for the U.S. Pension Plan. Compensation rate increases represent the weighted average of plans that are not frozen and therefore excludes the U.S. Pension Plan.
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,
  
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Discount rate
4.32
%
 
3.98
%
 
4.08
%
 
4.44
%
 
4.08
%
 
4.98
%
Expected long-term return on plan assets
5.99
%
 
6.25
%
 
6.16
%
 
—
%
 
—
%
 
—
%
Rate of compensation increase
5.90
%
 
3.24
%
 
3.22
%
 
4.00
%
 
2.83
%
 
3.08
%
Schedule of assumed health care cost trend rates
  
December 31,
  
2016
 
2015
 
2014
Health care cost trend rate assumed for next year
7.5
%
 
7.6
%
 
6.7
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
4.5
%
 
4.5
%
 
4.5
%
Year that the rate reaches the ultimate trend rate
2025

 
2024

 
2024
Schedule of effect of one-percentage-point change in assumed health care cost trend rates
(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
0.6

 
(0.5
)
Schedule of fair values of the pension plan assets by asset category
  
December 31, 2016
December 31, 2015
(Dollars in millions) 
Total
 
Level 1
 
Total
 
Level 1
Cash and cash equivalents
$
21.0

 
$
21.0

 
$
11.1

 
$
11.1

Equity securities:
 
 
 
 
 
 
 
U.S. large-cap
45.6

 
—

 
38.1

 
—

U.S. small-cap growth
4.3

 
—

 
5.5

 
—

Emerging markets
15.8

 
—

 
14.3

 
—

Real estate investment trusts
15.0

 
—

 
6.8

 
—

International large-cap value
31.7

 
—

 
48.2

 
—

Hedge fund
13.4

 
—

 
12.7

 
—

Fixed income securities:
 
 
 
 
 
 
 
Government bonds
42.3

 
—

 
48.1

 
—

Corporate bonds
85.8

 
—

 
94.7

 
—

Emerging markets
4.1

 
—

 
5.0

 
—

Total
$
279.0

 
$
21.0

 
$
284.5

 
$
11.1
Schedule of estimated future benefit payments expected to be paid
(Dollars in millions) 
Pension
Benefits
 
Other
Benefits
2017
$
32.7

 
$
2.5

2018
29.5

 
2.9

2019
28.9

 
3.2

2020
29.1

 
3.4

2021
25.1

 
3.6

Years 2022 - 2026
111.4

 
18.5