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Non Operating Income and Expenses
 12 Months Ended
Dec. 31, 2024
Other Income and Expenses [Abstract]  
Other Nonoperating Income and 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)