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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block] Intangible asset balances are as follows (in millions):
December 31, 2023December 31, 2022
Gross Carrying AmountAccumulated AmortizationNet AmountGross Carrying AmountAccumulated AmortizationNet Amount
Sales order book$54.6 $41.6 $13.0 $54.6 $39.9 $14.7 
Customer relationships68.9 42.5 26.4 68.9 37.9 31.0 
Total$123.5 $84.1 $39.4 $123.5 $77.8 $45.7 
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
The amount of amortization expense for intangible assets in each of the succeeding years is estimated to be as follows (in millions):
2024$8.9 
20259.1 
20267.4 
20276.0 
20284.6 
Thereafter3.4 
   Total$39.4