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Goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 114.1 $ 120.0
Goodwill [Line Items]    
Goodwill 114.1 120.0
Rail North America [Member]    
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill 23.8 23.8
Goodwill [Line Items]    
Goodwill 23.8 23.8
Rail International [Member]    
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill 53.3 56.8
Goodwill [Line Items]    
Goodwill 53.3 56.8
Other Business Segments [Member]    
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill 37.0 39.4
Goodwill [Line Items]    
Goodwill $ 37.0 $ 39.4