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Retirement Plans and Postretirement Benefits
 3 Months Ended
Mar. 31, 2025
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 Plans20252024
Service cost$0.8 $0.6 
Interest cost3.0 3.0 
Expected return on plan assets(3.3)(3.9)
Amortization of actuarial loss0.2 — 
Net periodic cost $0.6 $(0.3)

 Quarter Ended March 31,
Other Postretirement Employee Benefit Plans20252024
Service cost$— $0.1 
Interest cost0.6 0.7 
Amortization of actuarial gain(0.1)(0.1)
Net periodic cost$0.5 $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 component of net periodic cost is recorded in "Other non-operating income (expense)" on our Consolidated Statements of Operations. For the quarter ended March 31, 2025, we recorded $0.7 million to "Cost of sales" and $0.1 million to "Selling, general, and administrative expenses." For the quarter ended March 31, 2024, we recorded $0.5 million to "Cost of sales," $0.1 million to "Selling, general, and administrative expenses," and $0.1 million to Discontinued Operations.