PENSION PLANS AND RETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Benefit (Income) Cost

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended September 30,						Three Months Ended September 30,
	2019			2018			2019		2018
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	2.7		$	3.3		$	0.2	$	0.3
Interest cost	23.7			21.5			0.4		0.3
Expected return on plans’ assets	(35.5		)	(36.5		)	—		—
Recognized actuarial loss	6.8			8.6			0.5		0.6
Net periodic benefit (income) cost	$	(2.3	)	$	(3.1	)	$	1.1	$	1.2

	Pension Benefits						Other Postretirement Benefits
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019		2018
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	8.5		$	8.5		$	0.8	$	1.0
Interest cost	71.0			64.8			1.3		1.1
Expected return on plans’ assets	(106.3		)	(109.9		)	—		—
Recognized actuarial loss	20.2			25.9			1.6		1.8
Net periodic benefit (income) cost	$	(6.6	)	$	(10.7	)	$	3.7	$	3.9