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Retirement Plans and Postretirement Benefits
 9 Months Ended
Sep. 30, 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 September 30,Nine Months Ended September 30,
Pension Benefit Plans2025202420252024
Service cost$0.8 $0.6 $2.3 $1.9 
Interest cost3.0 3.0 8.9 8.9 
Expected return on plan assets(3.3)(3.9)(10.0)(11.8)
Amortization of actuarial loss0.2 — 0.6 0.1 
Net periodic cost $0.6 $(0.3)$1.7 $(0.9)

 Quarter Ended September 30,Nine Months Ended September 30,
Other Postretirement Employee Benefit Plans2025202420252024
Service cost$— $0.1 $0.1 $0.2 
Interest cost0.6 0.7 1.9 2.0 
Amortization of actuarial gain(0.1)(0.1)(0.4)(0.2)
Net periodic cost$0.5 $0.6 $1.6 $2.0 

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 and nine months ended September 30, 2025, we recorded $0.6 million and $2.0 million to "Cost of sales" and $0.2 million and $0.4 million to "Selling, general, and administrative
expenses". For the quarter and nine months ended September 30, 2024, we recorded $0.6 million and $1.7 million to "Cost of sales", $0.1 million and $0.4 million to "Selling, general, and administrative expenses", and $0.1 million and $0.2 million to Discontinued Operations.