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Non-operating Income (Expense) (Tables)
3 Months Ended
Mar. 31, 2024
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Quarter Ended March 31,
20242023
Interest expense$(6.7)$(7.6)
Amortization of deferred debt costs(0.4)(0.3)
Interest income0.6 0.3 
Interest expense, net(6.5)(7.6)
Non-operating pension and other postretirement employee benefits0.3 0.1 
Total non-operating expense$(6.2)$(7.5)