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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet AmountGross Carrying AmountAccumulated AmortizationNet Amount
Backlog
$54.6 $46.8 $7.8 $54.6 $41.6 $13.0 
Customer relationships68.9 47.1 21.8 68.9 42.5 26.4 
Total$123.5 $93.9 $29.6 $123.5 $84.1 $39.4 
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):
2025$8.4 
20267.2 
20276.0 
20284.6 
20293.4 
Thereafter— 
   Total$29.6