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Non-operating Income (Expense) (Notes)
6 Months Ended
Jun. 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 three and six months ended June 30, 2021 and 2020 are reflected in the table below:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Interest expense$(9.2)$(11.5)$(18.4)$(23.8)
Capitalized interest0.1 — 0.1 — 
Amortization of debt issuance costs(0.5)(0.5)(0.9)(1.1)
Interest income0.2 — 0.6 — 
Interest expense, net(9.3)(12.0)(18.6)(24.9)
Debt retirement costs— (1.0)— (1.0)
Non-operating pension and other postretirement employee benefits expense(2.5)(2.0)(5.0)(3.8)
Total non-operating expense$(11.8)$(14.9)$(23.6)$(29.6)