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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost

 
Pension Benefits

Other Postretirement
Benefits
 
Three Months Ended March 31,

Three Months Ended March 31,
 
2019

2018

2019

2018
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
3.1


$
2.7


$
0.3


$
0.3

Interest cost
23.6


21.6


0.4


0.4

Expected return on plans’ assets
(35.3
)

(36.8
)

—


—

Recognized actuarial loss
6.8


8.8


0.6


0.6

Net periodic benefit (income) cost
$
(1.8
)

$
(3.7
)

$
1.3


$
1.3