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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021December 31, 2020
Gross Carrying AmountAccumulated AmortizationNet AmountGross Carrying AmountAccumulated AmortizationNet Amount
Sales order book$54.6 $35.5 $19.1 $54.6 $32.0 $22.6 
Customer relationships68.9 33.3 35.6 68.9 28.7 40.2 
Total$123.5 $68.8 $54.7 $123.5 $60.7 $62.8 
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):
2022$9.5 
20236.6 
20248.6 
20257.6 
20269.9 
Thereafter12.5 
   Total$54.7