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Components of Net Periodic Benefit Cost (Tables)
3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Schedule of net periodic benefit cost
Pension Benefits
Three months ended March 31,
20242023
Service cost$0.6 $1.1 
Interest cost3.5 2.6 
Expected return on plan assets(3.8)(5.9)
Amortization of prior service costs0.1 — 
Amortization of net loss1.7 0.9 
Net periodic benefit cost (income)$2.1 $(1.3)
Other Postretirement Benefits
Three months ended March 31,
20242023
Interest cost$1.0 $0.7 
Amortization of net loss— 0.3 
Net periodic benefit cost$1.0 $1.0