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Pension and Other Postemployment Benefits
 3 Months Ended
Mar. 31, 2023
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits Pension and Other Postemployment Benefits
The components of net periodic benefit expense for our defined benefit pension plans and our postemployment arrangements were:
Defined Benefit Pension Plans
Postemployment Arrangements
Three Months Ended March 31,
Three Months Ended March 31,
2023202220232022
Service cost$0.9 $0.8 $0.9 $1.1 
Interest cost2.3 1.0 1.4 0.7 
Expected return on plan assets(0.2)(0.3)— — 
Amortization of prior service cost0.1 0.1 1.0 0.9 
Amortization of actuarial losses0.2 1.0 — 0.6 
Total net periodic benefit expense$3.3 $2.6 $3.3 $3.3 
We contributed $0.1 million and $0.2 million to our defined benefit pension plans in the three months ended March 31, 2023 and 2022, respectively.