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Pension and Other Postretirement Benefit Plans
 9 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Plans [Text Block] PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
 PensionOther
Postretirement
Components of Net Periodic Benefit Cost (Credit)2022202120222021
Millions    
Quarter Ended September 30,    
Service Cost$2.1 $2.7 $0.8 $0.9 
Non-Service Cost Components (a)
Interest Cost6.9 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 Loss2.8 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 Loss8.6 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.

Employer Contributions. For the nine months ended September 30, 2022, we made no contributions to the defined benefit pension plans ($10.3 million for the nine months ended September 30, 2021); we do not expect to make any contributions to our defined benefit pension plans in 2022. For the nine months ended September 30, 2022 and 2021, we made no contributions to our other postretirement benefit plans; we do not expect to make any contributions to our other postretirement benefit plans in 2022.