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Retirement Plans and Postretirement Benefits
 9 Months Ended
Sep. 30, 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 September 30,Nine Months Ended September 30,
Pension Benefit Plans2024202320242023
Service cost$0.6 $0.9 $1.9 $2.6 
Interest cost3.0 3.1 8.9 9.3 
Expected return on plan assets(3.9)(3.8)(11.8)(11.4)
Net periodic cost $(0.3)$0.2 $(0.9)$0.6 

 Quarter Ended September 30,Nine Months Ended September 30,
Other Postretirement Employee Benefit Plans2024202320242023
Service cost$0.1 $— $0.2 $0.1 
Interest cost0.7 0.7 2.0 2.1 
Amortization of actuarial gain(0.1)(0.1)(0.2)(0.4)
Net periodic cost$0.6 $0.6 $2.0 $1.8 
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 component of net periodic cost is recorded in "Other non-operating income" on our Consolidated Statements of Operations. For the quarter and nine months ended September 30, 2024, we recorded $0.6 million and $1.7 million to "Cost of sales" and $0.1 million and $0.4 million to "Selling, general, and administrative expenses." For the quarter and nine months ended September 30, 2023, we recorded $0.8 million and $2.3 million to "Cost of sales" and $0.1 million and $0.4 million to "Selling, general, and administrative expenses."