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Retirement Plans and Postretirement Benefits
 9 Months Ended
Sep. 30, 2023
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 Plans2023202220232022
Service cost$0.9 $0.5 $2.6 $1.6 
Interest cost3.1 2.2 9.3 6.6 
Expected return on plan assets(3.8)(2.8)(11.4)(8.5)
Amortization of actuarial loss— 1.5 0.1 4.6 
Net periodic cost $0.2 $1.5 $0.6 $4.4 

 Quarter Ended September 30,Nine Months Ended September 30,
Other Postretirement Employee Benefit Plans2023202220232022
Service cost$— $0.1 $0.1 $0.3 
Interest cost0.7 0.5 2.1 1.5 
Amortization of actuarial gain(0.1)— (0.4)— 
Net periodic cost$0.6 $0.6 $1.8 $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 components of net periodic cost are recorded to "Other non-operating (expense) income" on our Consolidated Statements of Operations. 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." For the quarter and nine months ended September 30, 2022, we recorded $0.5 million and $1.6 million to "Cost of sales" and less than $0.1 million and $0.3 million to "Selling, general, and administrative expenses."