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Non-operating Income (Expense) (Notes)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2025 and 2024 are reflected in the table below:
Quarter Ended June 30,Six Months Ended June 30,
2025202420252024
Interest expense$(3.9)$(9.9)$(7.3)$(11.6)
Amortization of debt issuance costs(0.6)(0.5)(1.1)(0.6)
Interest income0.5 0.8 1.1 1.4 
Interest expense, net(3.9)(9.6)(7.3)(10.8)
Non-operating pension and other postretirement employee benefits(0.3)0.3 (0.6)0.7 
Total non-operating expense$(4.2)$(9.3)$(7.9)$(10.1)