Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Expense (Income) [Table Text Block]

	Pension		Other Postretirement
Components of Net Periodic Benefit Cost (Credit)	2022	2021	2022	2021
Millions
Quarter Ended September 30,
Service Cost	$2.1	$2.7	$0.8	$0.9
Non-Service Cost Components (a)
Interest Cost	6.9	6.1	1.1	1.1
Expected Return on Plan Assets	(10.4)	(10.8)	(2.4)	(2.4)
Amortization of Prior Service Credits	—	—	(1.8)	(1.9)
Amortization of Net Loss	2.8	4.7	0.1	0.7
Net Periodic Benefit Cost (Credit)	$1.4	$2.7	$(2.2)	$(1.6)
Nine Months Ended September 30,
Service Cost	$6.9	$8.2	$2.3	$2.7
Non-Service Cost Components (a)
Interest Cost	20.4	18.4	3.3	3.3
Expected Return on Plan Assets	(31.1)	(32.5)	(7.2)	(7.3)
Amortization of Prior Service Credits	(0.1)	(0.1)	(5.6)	(5.7)
Amortization of Net Loss	8.6	14.1	0.3	2.2
Net Periodic Benefit Cost (Credit)	$4.7	$8.1	$(6.9)	$(4.8)

(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.