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Non-operating Income (Expense) (Notes)
3 Months Ended
Mar. 31, 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 ended March 31, 2023 and 2022 are reflected in the table below:
Quarter Ended March 31,
20232022
Interest expense$(7.6)$(8.2)
Amortization of deferred debt costs(0.3)(0.4)
Interest income0.3 — 
Interest expense, net(7.6)(8.6)
Debt retirement costs— (0.2)
Non-operating pension and other postretirement employee benefits (expense) benefit0.1 (1.4)
Total non-operating expense$(7.5)$(10.3)