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Pension and Other Postretirement Employee Benefit Plans - (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans
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:
 Three Months Ended June 30,Six Months Ended June 30,
Pension Benefit Plans2021202020212020
Service cost$0.5 $0.6 $0.9 $1.2 
Interest cost2.1 2.6 4.2 5.2 
Expected return on plan assets(2.6)(3.7)(5.3)(7.5)
Amortization of actuarial loss2.6 2.5 5.1 5.0 
Net periodic cost $2.5 $2.0 $5.0 $3.9 
 Three Months Ended June 30,Six Months Ended June 30,
Other Postretirement Employee  Benefit Plans2021202020212020
Service cost$— $— $0.1 $— 
Interest cost0.5 0.6 $0.9 $1.1 
Net periodic cost$0.5 $0.6 $1.0 $1.2 
Defined Contribution Plan Disclosures We record the service component of net periodic cost (benefit) as part of "Cost of sales" and "Selling, general, and administrative expenses," while the non-service components of net periodic cost (benefit) are recorded to "Other non-operating expense" on our Consolidated Statements of Operations. For the three and six months ended June 30, 2021, we recorded $0.4 million and $0.9 million to "Cost of sales" and less than $0.1 million and $0.1 million to "Selling, general, and administrative expenses." For the three and six months ended June 30, 2020, we recorded $0.4 million and $0.7 million to "Cost of sales" and $0.2 million and $0.5 million to "Selling, general, and administrative expenses."