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Defined Benefit Pension Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] e following table summarizes our net periodic pension cost for our defined benefit pension and postretirement plans during the three months ended March 31, 2021, and 2020:
Three Months Ended March 31,
20212020
Service cost$— $1 
Other components of net periodic pension cost1:
Interest cost2 3 
Expected return on plan assets(3)(4)
Amortization of prior service cost— — 
Amortization of net loss1 1 
Net periodic pension cost$1 $1 
1Other components of net periodic pension cost are included in Other non-operating items on our Condensed Consolidated Statements of Income.