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Pension and Other Postemployment Benefits
 6 Months Ended
Jun. 30, 2024
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits Pension and Other Postemployment Benefits
Net periodic benefit expense:
Defined Benefit Pension Plans
Postemployment Arrangements
Six Months Ended June 30, Six Months Ended June 30,
2024202320242023
Service cost$1.1 $1.7 $1.5 $1.7 
Interest cost2.9 5.1 3.0 2.8 
Expected return on plan assets(0.4)(0.5)— — 
Amortization of prior service cost0.2 0.2 2.2 1.9 
Amortization of actuarial losses0.4 0.4 0.1 — 
Total net periodic benefit expense$4.2 $6.9 $6.8 $6.4 
In the six months ended June 30, 2024 and 2023, we contributed $0.1 million and $0.3 million to our defined benefit pension plans, respectively.