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Non-operating Income (Expense) (Notes)
 9 Months Ended
Sep. 30, 2021
Nonoperating Income (Expense) [Abstract]  
Other Nonoperating Income and Expense [Text Block] NON-OPERATING INCOME (EXPENSE)
The components of “Non-operating expense” in the Consolidated Statements of Operations for the quarter and nine months ended September 30, 2021 and 2020 are reflected in the table below:
Quarter Ended September 30,Nine Months Ended September 30,
2021202020212020
Interest expense$(8.5)$(11.7)$(26.9)$(35.4)
Capitalized interest0.1 — 0.2 — 
Amortization of debt issuance costs(0.5)(0.5)(1.4)(1.7)
Interest income— — 0.6 — 
Interest expense, net(8.9)(12.2)(27.5)(37.0)
Debt retirement costs (0.5)(3.9)(0.5)(4.8)
Non-operating pension and other postretirement employee benefits expense(2.8)(1.9)(7.8)(5.7)
Total non-operating expense$(12.2)$(17.9)$(35.7)$(47.5)

For the third quarter and nine months ended September 30, 2021, debt retirement costs consist of $0.5 million associated with the write off of deferred debt costs related to the voluntary prepayments of the Term Loan maturing in 2026. For the quarter and nine months ended September 30, 2020, we recorded $3.9 million and $4.8 million in debt retirement cost consisting of $1.2 million related to the write off unamortized debt cost along with the premium on debt redemption of $2.1 million associated with the redemption of the $275.0 million aggregate principle amount of 4.5% senior notes due in 2023 and $0.6 million in the third quarter of 2020 and $1.6 million on in the first nine months of 2020 associated with the prepayment of the Term Loan maturing in 2026.