PENSION PLANS AND RETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2023

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,
	2023		2022		2023		2022
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	1.4	$	2.0	$	0.1	$	0.2
Interest cost	26.4		15.1		0.4		0.2
Expected return on plans’ assets	(32.9)		(34.3)		—		—
Amortization of prior service cost	(0.1)		—		—		—
Recognized actuarial loss	0.3		9.0		—		0.1
Net periodic benefit (income) cost	$	(4.9)	$	(8.2)	$	0.5	$	0.5

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	4.2	$	6.5	$	0.5	$	0.8
Interest cost	79.1		46.0		1.3		0.8
Expected return on plans’ assets	(98.5)		(102.8)		—		—
Amortization of prior service cost	(0.3)		(0.4)		0.1		0.1
Recognized actuarial loss	0.9		26.2		0.4		1.1
Net periodic benefit (income) cost	$	(14.6)	$	(24.5)	$	2.3	$	2.8