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Non-operating Income (Expense) (Notes)
3 Months Ended
Mar. 31, 2022
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, 2022 and 2021 are reflected in the table below:
Quarter Ended March 31,
20222021
Interest expense$(8.2)$(9.2)
Amortization of debt issuance costs(0.4)(0.5)
Interest income— 0.3 
Interest expense, net(8.6)(9.3)
Debt retirement costs(0.2)— 
Non-operating pension and other postretirement employee benefits expense(1.4)(2.5)
Total non-operating expense$(10.3)$(11.8)