Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 120.0	$ 117.2
Goodwill [Line Items]
Goodwill	120.0	117.2
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	56.8	55.1
Goodwill [Line Items]
Goodwill	56.8	55.1
Other Business Segments [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	39.4	38.3
Goodwill [Line Items]
Goodwill	$ 39.4	$ 38.3