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Non-operating Income (Expense) (Notes)
3 Months Ended
Mar. 31, 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 quarters ended March 31, 2024 and 2023 are reflected in the table below:
Quarter Ended March 31,
20242023
Interest expense$(6.7)$(7.6)
Amortization of deferred debt costs(0.4)(0.3)
Interest income0.6 0.3 
Interest expense, net(6.5)(7.6)
Non-operating pension and other postretirement employee benefits0.3 0.1 
Total non-operating expense$(6.2)$(7.5)