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POSTRETIREMENT BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2018
POSTRETIREMENT BENEFITS Disclosure [Abstract]  
Postretirement plan change in benefit obligation
Changes in the benefit obligation were as follows:
 
December 31, 2018
 
December 31, 2017
 
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Change in Benefit Obligation
($ in millions)
Benefit obligation at beginning of year
$
40.6

 
$
10.2

 
$
50.8

 
$
43.6

 
$
8.6

 
$
52.2

Service cost
0.9

 
0.4

 
1.3

 
0.8

 
0.3

 
1.1

Interest cost
1.2

 
0.3

 
1.5

 
1.2

 
0.3

 
1.5

Actuarial (gain) loss
(2.0
)
 
(0.1
)
 
(2.1
)
 
(0.6
)
 
1.0

 
0.4

Benefits paid
(3.2
)
 
(0.4
)
 
(3.6
)
 
(4.4
)
 
(0.3
)
 
(4.7
)
Foreign currency translation adjustments
—

 
(0.9
)
 
(0.9
)
 
—

 
0.3

 
0.3

Benefit obligation at end of year
$
37.5

 
$
9.5

 
$
47.0

 
$
40.6

 
$
10.2

 
$
50.8


 
December 31, 2018
 
December 31, 2017
 
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
 
($ in millions)
Funded status
$
(37.5
)
 
$
(9.5
)
 
$
(47.0
)
 
$
(40.6
)
 
$
(10.2
)
 
$
(50.8
)
Amounts recognized in consolidated balance sheet
Amounts recognized in the consolidated balance sheets consisted of:
 
December 31, 2018
 
December 31, 2017
 
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
 
($ in millions)
Accrued benefit in current liabilities
$
(3.6
)
 
$
(0.3
)
 
$
(3.9
)
 
$
(4.0
)
 
$
(0.3
)
 
$
(4.3
)
Accrued benefit in noncurrent liabilities
(33.9
)
 
(9.2
)
 
(43.1
)
 
(36.6
)
 
(9.9
)
 
(46.5
)
Accumulated other comprehensive loss
20.1

 
1.0

 
21.1

 
24.7

 
0.9

 
25.6

Net balance sheet impact
$
(17.4
)
 
$
(8.5
)
 
$
(25.9
)
 
$
(15.9
)
 
$
(9.3
)
 
$
(25.2
)
Components of net periodic benefit cost
 
Years Ended December 31,

2018
 
2017
 
2016
Components of Net Periodic Benefit Cost
($ in millions)
Service cost
$
1.3

 
$
1.1

 
$
1.2

Interest cost
1.5

 
1.5

 
1.6

Amortization of prior service cost
—

 
(2.2
)
 
(2.6
)
Recognized actuarial loss
2.4

 
2.1

 
2.3

Net periodic benefit cost
$
5.2

 
$
2.5

 
$
2.5

 
 
 
 
 
 
Included in Other Comprehensive Loss (Pretax)
 
 
 
 
 
Liability adjustment
$
(2.1
)
 
$
0.4

 
$
(5.1
)
Amortization of prior service costs and actuarial losses
(2.4
)
 
0.1

 
0.3
Schedule of actuarial assumption
 
December 31,
Weighted-Average Assumptions
2018
 
2017
 
2016
Discount rate—periodic benefit cost
3.5
%
 
3.8
%
 
4.1
%
Discount rate—benefit obligation
4.1
%
 
3.5
%
 
3.8
%
Assumed healthcare cost trend rates
The assumed healthcare cost trend rates for pre-65 retirees were as follows:
 
December 31,
 
2018
 
2017
Healthcare cost trend rate assumed for next year
7.5
%
 
8.0
%
Rate that the cost trend rate gradually declines to
4.5
%
 
4.5
%
Year that the rate reaches the ultimate rate
2024

 
2024