PENSION PLANS AND RETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2024

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,
	2024		2023		2024		2023
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	1.3	$	1.4	$	0.2	$	0.2
Interest cost	25.1		26.3		0.4		0.5
Expected return on plans’ assets	(33.9)		(32.9)		—		—
Amortization of prior service cost	(0.1)		(0.1)		—		—
Recognized actuarial loss	1.5		0.3		0.2		0.2
Net periodic benefit (income) cost	$	(6.1)	$	(5.0)	$	0.8	$	0.9