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