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Pension and Other Postemployment Benefits
 3 Months Ended
Mar. 31, 2025
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits Pension and Other Postemployment Benefits
Pension and other postemployment benefits net periodic benefit expense:
Defined Benefit Pension Plans
Postemployment Arrangements
Three Months Ended March 31,
Three Months Ended March 31,
2025202420252024
Service cost$1.5 $0.6 $0.5 $0.8 
Interest cost1.8 1.0 1.4 1.5 
Expected return on plan assets(0.2)(0.2)— — 
Amortization of prior service cost0.8 0.1 0.9 1.1 
Amortization of actuarial losses0.5 0.2 — 0.1 
Total net periodic benefit expense$4.4 $1.7 $2.8 $3.5 
In each of the three months ended March 31, 2025 and 2024, we contributed $0.1 million to the defined benefit pension plans.