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Pension and Other Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2023
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)2023202220232022
Millions    
Quarter Ended June 30,    
Service Cost$1.6 $2.4 $0.5 $0.7 
Non-Service Cost Components (a)
Interest Cost10.1 6.8 1.5 1.1 
Expected Return on Plan Assets(11.0)(10.3)(2.8)(2.4)
Amortization of Prior Service Credits— (0.1)(1.7)(1.9)
Amortization of Net Loss1.5 2.6 (0.6)0.1 
Net Periodic Benefit Cost (Credit)$2.2 $1.4 $(3.1)$(2.4)
Six Months Ended June 30,
Service Cost$3.2 $4.8 $1.1 $1.5 
Non-Service Cost Components (a)
Interest Cost 20.2 13.5 3.0 2.2 
Expected Return on Plan Assets (21.9)(20.7)(5.6)(4.8)
Amortization of Prior Service Credits — (0.1)(3.5)(3.8)
Amortization of Net Loss2.9 5.8 (1.1)0.2 
Net Periodic Benefit Cost (Credit)$4.4 $3.3 $(6.1)$(4.7)
(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 six months ended June 30, 2023, we contributed $6.5 million in cash to the defined benefit pension plans (none for the six months ended June 30, 2022); we expect to contribute an additional approximately $10 million to our defined benefit pension plans in 2023. For the six months ended June 30, 2023 and 2022, 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 2023.