Asset Impairments and Assets Held for Sale Asset Held For Sale (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	$ 2.4	$ 0.3	$ 6.6
Assets Held-for-sale, Long Lived, Fair Value Disclosure	3.8	4.8
Portfolio Management [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	0.0	0.0	6.2
Rail North America [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	2.4	0.3	0.4
Rail International [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	$ 0.0	$ 0.0	$ 0.0