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POSTRETIREMENT BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2016
POSTRETIREMENT BENEFITS Disclosure [Abstract]  
Postretirement plan change in benefit obligation
Changes in the benefit obligation were as follows:

 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
Change in Benefit Obligation
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Benefit obligation at beginning of year
$
53.9

 
$
8.1

 
$
62.0

 
$
58.5

 
$
8.7

 
$
67.2

Service cost
0.8

 
0.4

 
1.2

 
1.1

 
0.1

 
1.2

Interest cost
1.2

 
0.4

 
1.6

 
2.0

 
0.3

 
2.3

Actuarial loss (gain)
(5.1
)
 
—

 
(5.1
)
 
(0.7
)
 
0.7

 
—

Benefits paid
(7.2
)
 
(0.4
)
 
(7.6
)
 
(7.0
)
 
(0.3
)
 
(7.3
)
Currency translation adjustments
—

 
0.1

 
0.1

 
—

 
(1.5
)
 
(1.5
)
Curtailment
—

 
—

 
—

 
—

 
0.1

 
0.1

Benefit obligation at end of year
$
43.6

 
$
8.6

 
$
52.2

 
$
53.9

 
$
8.1

 
$
62.0


 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
 
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Funded status
$
(43.6
)
 
$
(8.6
)
 
$
(52.2
)
 
$
(53.9
)
 
$
(8.1
)
 
$
(62.0
)
Amounts recognized in consolidated balance sheet
Amounts recognized in the consolidated balance sheets consisted of:

 
December 31, 2016
 
December 31, 2015
 
($ in millions)
 
($ in millions)
 
U.S.
 
Foreign
 
Total
 
U.S.
 
Foreign
 
Total
Accrued benefit in current liabilities
$
(4.8
)
 
$
(0.3
)
 
$
(5.1
)
 
$
(5.3
)
 
$
(0.3
)
 
$
(5.6
)
Accrued benefit in noncurrent liabilities
(38.8
)
 
(8.3
)
 
(47.1
)
 
(48.6
)
 
(7.8
)
 
(56.4
)
Accumulated other comprehensive loss
24.8

 
0.3

 
25.1

 
29.7

 
0.2

 
29.9

Net balance sheet impact
$
(18.8
)
 
$
(8.3
)
 
$
(27.1
)
 
$
(24.2
)
 
$
(7.9
)
 
$
(32.1
)
Components of net periodic benefit cost
 
Years Ended December 31,

2016
 
2015
 
2014
Components of Net Periodic Benefit Cost
($ in millions)
Service cost
$
1.2

 
$
1.2

 
$
1.1

Interest cost
1.6

 
2.3

 
2.7

Amortization of prior service cost
(2.6
)
 
—

 
(0.1
)
Recognized actuarial loss
2.3

 
3.1

 
2.9

Curtailment
—

 
0.1

 
—

Net periodic benefit cost
$
2.5

 
$
6.7

 
$
6.6

 
 
 
 
 
 
Included in Other Comprehensive Loss (Pretax)
 
 
 
 
 
Liability adjustment
$
(5.1
)
 
$
(0.1
)
 
$
3.1

Amortization of prior service costs and actuarial losses
0.3

 
(3.2
)
 
(2.8
)
Schedule of actuarial assumption
 
December 31,
Weighted-Average Assumptions
2016
 
2015
 
2014
Discount rate—periodic benefit cost
4.1
%
 
3.7
%
 
4.3
%
Discount rate—benefit obligation
3.8
%
 
4.1
%
 
3.7
%
Assumed healthcare cost trend rates
The assumed healthcare cost trend rates for pre-65 retirees were as follows:

 
December 31,
 
2016
 
2015
Healthcare cost trend rate assumed for next year
8.0
%
 
8.5
%
Rate that the cost trend rate gradually declines to
5.0
%
 
5.0
%
Year that the rate reaches the ultimate rate
2022

 
2022
Effects of one percent change in the assumed health care cost trend rates
 A one-percentage-point change in assumed healthcare cost trend rates would have the following effects:

 
One-Percentage
Point Increase
 
One-Percentage
Point Decrease
 
($ in millions)
Effect on total of service and interest costs
$
0.6

 
$
(0.4
)
Effect on postretirement benefit obligation
2.1

 
(1.8
)