Asset Impairments and Assets Held for Sale Asset Held For Sale (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	$ 0.8	$ 40.0
Portfolio Management [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0.0	25.1
Rail North America [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0.8	1.2
Rail International [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	$ 0.0	$ 13.7