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Non Operating Income and Expenses (Tables)
 12 Months Ended
Dec. 31, 2024
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) Non-Operating Expense
The major components of “Non-operating expense” in the Consolidated Statements of Operations are:
Years Ended December 31,
202420232022
Interest expense$(32.0)$(11.8)$(11.7)
Capitalized interest1.6 0.3 0.1 
Amortization of debt issuance costs and accretion of debt discount(1.7)(0.5)(0.6)
Interest income2.9 2.4 1.0 
Interest expense, net(29.2)(9.5)(11.2)
Debt retirement costs(9.1)(3.1)(0.5)
Non-operating pension and other postretirement employee benefits income (expense) 1.8 0.1 (5.7)
Total non-operating expense$(36.6)$(12.5)$(17.4)
During 2024, we repaid the outstanding term loans under the PCA Credit Agreement with proceeds from the sale of our tissue business. As a result of this repayment, we recognized a loss on debt extinguishment of $9.1 million, consisting of unamortized deferred debt costs. During 2023, we redeemed our 2014 Notes in full. This redemption resulted in a loss on early debt extinguishment of $3.1 million consisting of $0.4 million related to the write off of unamortized deferred debt costs along with the premium on debt redemption of $2.7 million.