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Retirement Plans and Postretirement Benefits - (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Cost of 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 June 30,Six Months Ended June 30,
Pension Benefit Plans2024202320242023
Service cost$0.6 $0.9 $1.3 $1.7 
Interest cost3.0 3.1 5.9 6.2 
Expected return on plan assets(3.9)(3.8)(7.9)(7.6)
Net periodic cost $(0.3)$0.2 $(0.6)$0.4 

 Quarter Ended June 30,Six Months Ended June 30,
Other Postretirement Employee Benefit Plans2024202320242023
Service cost$0.1 $— $0.1 $0.1 
Interest cost0.7 0.7 1.3 1.4 
Amortization of actuarial gain(0.1)(0.1)(0.1)(0.3)
Net periodic cost$0.6 $0.6 $1.3 $1.2 
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 are recorded to "Other non-operating income" on our Consolidated Statements of Operations. For the quarter and six months ended June 30, 2024, we recorded $0.6 million and $1.1 million to "Cost of sales" and $0.1 million and $0.3 million to "Selling, general, and administrative expenses." For the quarter and six months ended June 30, 2023, we recorded $0.8 million and $1.5 million to "Cost of sales" and $0.1 million and $0.3 million to "Selling, general, and administrative expenses."