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Non-operating Income (Expense) (Notes)
3 Months Ended
Mar. 31, 2025
Nonoperating Income (Expense) [Abstract]  
Other Nonoperating Income and Expense [Text Block] Non-Operating Expense
The components of “Non-operating expense” in the Consolidated Statements of Operations for the quarter ended March 31, 2025 and 2024 are reflected in the table below:
Quarter Ended March 31,
20252024
Interest expense$(3.4)$(1.7)
Amortization of debt issuance costs(0.6)(0.1)
Interest income0.6 0.6 
Interest expense, net(3.3)(1.2)
Non-operating pension and other postretirement employee benefits(0.3)0.3 
Total non-operating expense$(3.6)$(0.9)