PENSION PLANS AND RETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2020

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,
	2020			2019			2020		2019
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	3.0		$	3.1		$	0.3	$	0.3
Interest cost	18.7			23.6			0.4		0.4
Expected return on plans’ assets	(35.6		)	(35.3		)	—		—
Recognized actuarial loss	11.2			6.8			0.7		0.6
Net periodic benefit (income) cost	$	(2.7	)	$	(1.8	)	$	1.4	$	1.3