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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] Intangible asset balances are as follows (in millions):
March 31, 2025December 31, 2024
Gross Carrying AmountAccumulated AmortizationNet AmountGross Carrying AmountAccumulated AmortizationNet Amount
Backlog
$54.6 $46.8 $7.8 $54.6 $46.8 $7.8 
Customer relationships68.9 48.2 20.7 68.9 47.1 21.8 
Total$123.5 $95.0 $28.5 $123.5 $93.9 $29.6