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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Activity included in accumulated other comprehensive loss table
The following table represents the activity included in accumulated other comprehensive loss:

 
Foreign
Currency
Translation
Adjustment
(net of taxes)
 
Unrealized
Gains (Losses)
on Derivative
Contracts
(net of taxes)
 
Pension and
Postretirement
Benefits
(net of taxes)
 
Accumulated
Other
Comprehensive
Loss
 
($ in millions)
Balance at January 1, 2015
$
(2.3
)
 
$
(4.2
)
 
$
(436.6
)
 
$
(443.1
)
Unrealized losses
(15.7
)
 
(13.9
)
 
(125.3
)
 
(154.9
)
Reclassification adjustments into income
—

 
9.7

 
65.6

 
75.3

Tax benefit
5.9

 
1.5

 
22.8

 
30.2

Net change
(9.8
)
 
(2.7
)
 
(36.9
)
 
(49.4
)
Balance at December 31, 2015
(12.1
)
 
(6.9
)
 
(473.5
)
 
(492.5
)
Unrealized (losses) gains
(22.4
)
 
26.3

 
(61.0
)
 
(57.1
)
Reclassification adjustments into income
—

 
5.8

 
20.4

 
26.2

Tax benefit (provision)
10.4

 
(12.4
)
 
15.4

 
13.4

Net change
(12.0
)
 
19.7

 
(25.2
)
 
(17.5
)
Balance at December 31, 2016
(24.1
)
 
12.8

 
(498.7
)
 
(510.0
)
Unrealized gains (losses)
55.6

 
1.9

 
(27.3
)
 
30.2

Reclassification adjustments into income
—

 
(4.6
)
 
26.9

 
22.3

Tax (provision) benefit
(23.9
)
 
1.0

 
(4.2
)
 
(27.1
)
Net change
31.7

 
(1.7
)
 
(4.6
)
 
25.4

Balance at December 31, 2017
$
7.6

 
$
11.1

 
$
(503.3
)
 
$
(484.6
)