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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit (Income) Cost
 
Pension Benefits
 
Other Postretirement
Benefits
 
Three Months Ended
June 30,

Three Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
1.4

 
$
1.6

 
$
0.3

 
$
0.3

Interest cost
20.5

 
22.6

 
0.7

 
0.8

Expected return on plans’ assets
(34.4
)
 
(35.6
)
 
—

 
—

Amortization of prior service cost
0.1

 
0.1

 
(0.1
)
 
(0.1
)
Recognized actuarial loss
7.3

 
5.9

 
1.1

 
1.0

Net periodic benefit (income) cost
$
(5.1
)
 
$
(5.4
)
 
$
2.0

 
$
2.0

 
 
 
 
 
 
 
 
 
Pension Benefits
 
Other Postretirement
Benefits
 
Six Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
3.1

 
$
3.1

 
$
0.7

 
$
0.7

Interest cost
40.7

 
46.1

 
1.4

 
1.7

Expected return on plans’ assets
(68.8
)
 
(69.8
)
 
—

 
—

Amortization of prior service cost
0.1

 
0.1

 
(0.1
)
 
(0.1
)
Recognized actuarial loss
14.8

 
10.2

 
2.1

 
1.9

Net periodic benefit (income) cost
$
(10.1
)
 
$
(10.3
)
 
$
4.1

 
$
4.2