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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost

 
Pension Benefits

Other Postretirement
Benefits
 
Six Months Ended June 30,

Six Months Ended June 30,
 
2019

2018

2019

2018
Components of Net Periodic Benefit (Income) Cost
($ in millions)
Service cost
$
5.8


$
5.2


$
0.6


$
0.7

Interest cost
47.3


43.3


0.9


0.8

Expected return on plans’ assets
(70.8
)

(73.4
)

—


—

Recognized actuarial loss
13.4


17.3


1.1


1.2

Net periodic benefit (income) cost
$
(4.3
)

$
(7.6
)

$
2.6


$
2.7