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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit (Income) Cost
 
Pension Benefits

Other Postretirement
Benefits
 
Three Months Ended
March 31,

Three Months Ended
March 31,
 
2017

2016

2017

2016
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
4.3


$
3.2


$
0.3


$
0.3

Interest cost
21.7


22.4


0.4


0.5

Expected return on plans’ assets
(39.1
)

(39.8
)

—


—

Amortization of prior service cost
—

 
—

 
(0.6
)
 
—

Recognized actuarial loss
6.6


5.3


0.6


0.8

Net periodic benefit (income) cost
$
(6.5
)

$
(8.9
)

$
0.7


$
1.6