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Non-operating Income (Expense) (Notes)
9 Months Ended
Sep. 30, 2023
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, 2023 and 2022 are reflected in the table below:
Quarter Ended September 30,Nine Months Ended September 30,
2023202220232022
Interest expense$(7.4)$(8.0)$(22.6)$(26.6)
Amortization of deferred debt costs(0.3)(0.4)(0.9)(1.2)
Interest income0.9 0.3 1.5 0.4 
Interest expense, net(6.9)(8.0)(22.0)(27.3)
Debt retirement costs— — — (0.5)
Non-operating pension and other postretirement employee benefits (expense)0.1 (1.4)0.3 (4.3)
Total non-operating expense$(6.8)$(9.4)$(21.7)$(32.1)