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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit (Income) Cost

 
Pension Benefits
 
Other Postretirement
Benefits
 
Three Months Ended
September 30,
 
Three Months Ended
September 30,
 
2015
 
2014
 
2015
 
2014
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
1.5

 
$
1.3

 
$
0.3

 
$
0.2

Interest cost
20.5

 
21.5

 
0.4

 
0.5

Expected return on plans’ assets
(35.4
)
 
(34.8
)
 
—

 
—

Recognized actuarial loss
7.4

 
5.4

 
0.6

 
0.1

Net periodic benefit (income) cost
$
(6.0
)
 
$
(6.6
)
 
$
1.3

 
$
0.8




 
Pension Benefits
 
Other Postretirement
Benefits
 
Nine Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2015
 
2014
 
2015
 
2014
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
4.4

 
$
4.0

 
$
0.9

 
$
0.8

Interest cost
61.7

 
64.9

 
1.7

 
2.0

Expected return on plans’ assets
(106.7
)
 
(104.6
)
 
—

 
—

Amortization of prior service cost
0.1

 
0.1

 
—

 
(0.1
)
Recognized actuarial loss
22.3

 
16.7

 
2.4

 
2.1

Curtailment
0.1

 
—

 
0.1

 
—

Net periodic benefit (income) cost
$
(18.1
)
 
$
(18.9
)
 
$
5.1

 
$
4.8