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Non-operating Income (Expense) (Notes)
 9 Months Ended
Sep. 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 nine months ended September 30, 2025 and 2024 are reflected in the table below:
Quarter Ended September 30,Nine Months Ended September 30,
2025202420252024
Interest expense$(4.5)$(13.0)$(11.8)$(24.6)
Amortization of debt issuance costs(0.6)(0.6)(1.7)(1.2)
Interest income0.3 0.4 1.4 1.8 
Interest expense, net(4.7)(13.1)(12.0)(24.0)
Non-operating pension and other postretirement employee benefits(0.3)0.3 (0.9)1.0 
Total non-operating expense$(5.0)$(12.8)$(12.9)$(22.9)