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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022December 31, 2021
Gross Carrying AmountAccumulated AmortizationNet AmountGross Carrying AmountAccumulated AmortizationNet Amount
Sales order book$54.6 $39.9 $14.7 $54.6 $35.5 $19.1 
Customer relationships68.9 37.9 31.0 68.9 33.3 35.6 
Total$123.5 $77.8 $45.7 $123.5 $68.8 $54.7 
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):
2023$6.3 
20249.4 
20258.9 
20267.3 
20275.9 
Thereafter7.9 
   Total$45.7