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Non-operating Income (Expense) (Tables)
6 Months Ended
Jun. 30, 2022
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Quarter Ended June 30,Six Months Ended June 30,
2022202120222021
Interest expense$(10.4)$(9.1)$(18.6)$(18.2)
Amortization of debt issuance costs(0.4)(0.5)(0.8)(0.9)
Interest income0.1 0.2 0.1 0.6 
Interest expense, net(10.7)(9.3)(19.3)(18.6)
Debt retirement costs(0.3)— (0.5)— 
Non-operating pension and other postretirement employee benefits expense(1.4)(2.5)(2.8)(5.0)
Total non-operating expense$(12.4)$(11.8)$(22.7)$(23.6)