PENSION PLANS AND RETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 30, 2022

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,
	2022		2021		2022		2021
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	2.2	$	2.8	$	0.3	$	0.3
Interest cost	15.5		12.8		0.3		0.3
Expected return on plans’ assets	(34.3)		(35.0)		—		—
Amortization of prior service cost	(0.2)		(0.2)		0.1		0.1
Recognized actuarial loss	8.6		13.2		0.5		0.6
Net periodic benefit (income) cost	$	(8.2)	$	(6.4)	$	1.2	$	1.3

	Pension Benefits				Other Postretirement Benefits
	Six Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	4.5	$	5.8	$	0.6	$	0.7
Interest cost	30.9		25.6		0.6		0.6
Expected return on plans’ assets	(68.5)		(71.1)		—		—
Amortization of prior service cost	(0.4)		(0.3)		0.1		0.1
Recognized actuarial loss	17.2		26.3		1.0		1.3
Net periodic benefit (income) cost	$	(16.3)	$	(13.7)	$	2.3	$	2.7