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Non-operating Income (Expense) (Tables)
6 Months Ended
Jun. 30, 2021
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
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)