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Note 8. Intangible Assets, Goodwill and Other (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill by segment is as follows. There were no changes to our goodwill during the year ended December 31, 2024.
December 31, 2024December 31, 2023
Railcar Leasing and Services Group$50.6 $50.6 
Rail Products Group170.9 170.9
$221.5 $221.5 
Schedule of Intangible Assets and Goodwill
A summary of our intangible assets, which are included in other assets in our Consolidated Balance Sheets, is as follows:
December 31, 2024December 31, 2023
Weighted Average Useful LifeGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in years)(in millions)
Indefinite-lived intangible assets:
Trade names*$11.2 $— $11.2 $11.2 $— $11.2 
Finite-lived intangible assets:
Customer relationships & backlog14.353.6 (9.3)44.3 53.6 (5.8)47.8 
Patents, developed technology, and other9.336.8 (13.6)23.2 36.6 (9.4)27.2 
Lease-related intangibles12.138.5 (18.2)20.3 35.9 (15.4)20.5 
Total finite-lived intangible assets128.9 (41.1)87.8 126.1 (30.6)95.5 
Total intangible assets$140.1 $(41.1)$99.0 $137.3 $(30.6)$106.7 
*Not subject to amortization
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense As of December 31, 2024, expected amortization expense related to our finite-lived intangible assets for the next five years is as follows:
Expected Amortization Expense
(in millions)
2025$9.1 
2026$9.1 
2027$8.7 
2028$6.6 
2029$6.2