PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2024

Retirement Benefits [Abstract]

Schedule of Components in Net Periodic Benefit Cost (Credit)

Components of Net Periodic Benefit Cost (Credit)	Pension		Other Postretirement
	2024	2023	2024	2023
Millions
Quarter Ended September 30,
Service Cost	$1.6	$1.7	$0.3	$0.6
Non-Service Cost Components (a)
Interest Cost	9.7	10.2	1.0	1.6
Expected Return on Plan Assets	(11.2)	(10.9)	(2.7)	(2.9)
Amortization of Prior Service Credits	(0.1)	(0.1)	(2.9)	(1.8)
Amortization of Net Loss (Gain)	1.7	1.4	(0.8)	(0.6)
Net Periodic Benefit Cost (Credit)	$1.7	$2.3	$(5.1)	$(3.1)
Nine Months Ended September 30,
Service Cost	$4.9	$4.9	$1.1	$1.7
Non-Service Cost Components (a)
Interest Cost	29.0	30.4	2.9	4.6
Expected Return on Plan Assets	(33.6)	(32.8)	(8.3)	(8.5)
Amortization of Prior Service Credits	(0.1)	(0.1)	(8.7)	(5.3)
Amortization of Net Loss (Gain)	4.9	4.3	(2.4)	(1.7)
Net Periodic Benefit Cost (Credit)	$5.1	$6.7	$(15.4)	$(9.2)

(a)These components of net periodic benefit cost (credit) are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.