Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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
Three Months Ended March 31,
Service Cost	$2.4	$2.7	$0.8	$0.9
Non-Service Cost Components (a)
Interest Cost	6.7	6.1	1.1	1.1
Expected Return on Plan Assets	(10.4)	(10.8)	(2.4)	(2.4)
Amortization of Prior Service Credits	—	—	(1.9)	(1.9)
Amortization of Net Loss	3.2	4.7	0.1	0.7
Net Periodic Benefit Cost (Credit)	$1.9	$2.7	$(2.3)	$(1.6)

(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.