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Non-operating Income (Expense) (Notes)
 9 Months Ended
Sep. 30, 2024
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, 2024 and 2023 are reflected in the table below:
Quarter Ended September 30,Nine Months Ended September 30,
2024202320242023
Interest expense$(13.0)$(3.0)$(24.6)$(9.1)
Amortization of debt issuance costs and accretion of debt discount(0.6)(0.1)(1.2)(0.4)
Interest income0.4 0.9 1.8 1.5 
Interest expense, net(13.1)(2.2)(24.0)(7.9)
Non-operating pension and other postretirement employee benefits0.3 0.1 1.0 0.3 
Total non-operating expense$(12.8)$(2.1)$(22.9)$(7.6)