PENSION PLANS AND RETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Components of Net Periodic Benefit (Income) Cost

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
	2020			2019			2020		2019
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	2.7		$	2.7		$	0.4	$	0.3
Interest cost	18.8			23.7			0.3		0.5
Expected return on plans’ assets	(35.6		)	(35.5		)	—		—
Recognized actuarial loss	11.1			6.6			0.5		0.5
Net periodic benefit (income) cost	$	(3.0	)	$	(2.5	)	$	1.2	$	1.3

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020		2019
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	5.7		$	5.8		$	0.7	$	0.6
Interest cost	37.5			47.3			0.7		0.9
Expected return on plans’ assets	(71.2		)	(70.8		)	—		—
Recognized actuarial loss	22.3			13.4			1.2		1.1
Net periodic benefit (income) cost	$	(5.7	)	$	(4.3	)	$	2.6	$	2.6