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Retirement Plans and Postretirement Benefits
 3 Months Ended
Mar. 31, 2024
Postemployment Benefits [Abstract]  
Pension and Other Postretirement Employee Benefit Plans Retirement Plans and Postretirement Benefits
The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented:
 Quarter Ended March 31,
Pension Benefit Plans20242023
Service cost$0.6 $0.9 
Interest cost3.0 3.1 
Expected return on plan assets(3.9)(3.8)
Net periodic cost $(0.3)$0.2 

 Quarter Ended March 31,
Other Postretirement Employee Benefit Plans20242023
Service cost$0.1 $— 
Interest cost0.7 0.7 
Amortization of actuarial gain(0.1)(0.1)
Net periodic cost$0.6 $0.6 
We record the service component of net periodic cost as part of "Cost of sales" and "Selling, general, and administrative expenses," while the non-service components of net periodic cost are recorded to "Other non-operating income" on our Consolidated Statements of Operations. For the quarter ended March 31, 2024, we recorded $0.6 million to "Cost of sales" and $0.1 million to "Selling, general, and administrative expenses." For the quarter ended March 31, 2023, we recorded $0.8 million to "Cost of sales" and $0.1 million to "Selling, general, and administrative expenses."