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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost
 
Pension Benefits
 
Other Postretirement
Benefits
 
Three Months Ended September 30,
 
Three Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
4.3

 
$
3.3

 
$
0.3

 
$
0.2

Interest cost
21.8

 
21.8

 
0.3

 
0.3

Expected return on plans’ assets
(39.2
)
 
(39.5
)
 
—

 
—

Amortization of prior service cost
—

 
(0.1
)
 
(0.6
)
 
(2.0
)
Recognized actuarial loss
6.8

 
5.2

 
0.6

 
0.2

Net periodic benefit (income) cost
$
(6.3
)
 
$
(9.3
)
 
$
0.6

 
$
(1.3
)

 
Pension Benefits

Other Postretirement
Benefits
 
Nine Months Ended September 30,

Nine Months Ended September 30,
 
2017

2016

2017

2016
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
12.7


$
9.2


$
0.9


$
0.9

Interest cost
65.0


66.0


1.1


1.2

Expected return on plans’ assets
(117.6
)

(118.4
)

—


—

Amortization of prior service cost
—

 
—

 
(1.9
)
 
(2.0
)
Recognized actuarial loss
20.2


15.5


1.9


1.8

Net periodic benefit (income) cost
$
(19.7
)

$
(27.7
)

$
2.0


$
1.9