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Employee Benefits Schedule of Net Benefit Costs (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Net Periodic Cost
The components of net periodic benefit cost and key assumptions are listed below.
 Domestic Pension PlanForeign Pension PlansDomestic Postretirement Benefit Plan
Years ended December 31,202020192018202020192018202020192018
Service cost$0.0 $0.0 $0.0 $4.9 $4.8 $5.4 $0.0 $0.0 $0.0 
Interest cost3.7 4.8 4.5 9.4 12.4 13.1 0.8 1.2 1.1 
Expected return on plan assets(5.7)(5.9)(6.6)(18.8)(17.4)(18.8)0.0 0.0 0.0 
Settlement and curtailment0.0 0.0 0.0 (0.1)0.0 (1.0)0.0 0.0 0.0 
Amortization of:
Prior service cost (credit)0.0 0.0 0.0 0.1 0.1 0.1 0.0 (0.2)(0.2)
Net actuarial losses1.7 1.9 1.6 5.4 4.8 5.9 0.2 0.1 0.1 
Net periodic cost$(0.3)$0.8 $(0.5)$0.9 $4.7 $4.7 $1.0 $1.1 $1.0 
Assumptions
 Domestic Pension PlanForeign Pension PlansDomestic Postretirement Benefit Plan
Years ended December 31,202020192018202020192018202020192018
Net periodic cost
Discount rate3.35 %4.35 %3.70 %1.84 %2.61 %2.36 %3.25 %4.30 %3.65 %
Rate of compensation increaseN/AN/AN/A2.51 %2.58 %2.37 %N/AN/AN/A
Expected return on plan assets6.00 %7.00 %7.00 %4.70 %4.76 %4.70 %N/AN/AN/A
Interest crediting rates5.10 %5.10 %5.10 %1.37 %1.44 %1.31 %N/AN/AN/A
Benefit obligation
Discount rate2.60 %3.35 %4.35 %1.35 %1.84 %2.61 %2.50 %3.25 %4.30 %
Rate of compensation increaseN/AN/AN/A2.47 %2.51 %2.58 %N/AN/AN/A
Interest crediting rates5.10 %5.10 %5.10 %1.50 %1.37 %1.44 %N/AN/AN/A
Health care cost trend rate assumed for next year
Initial rate (weighted-average)6.75 %7.00 %6.25 %
Year ultimate rate is reached202820282024
Ultimate rate5.00 %5.00 %5.00 %