Asset Impairments and Assets Held for Sale (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ 137.8	$ 130.9	$ 121.2
Asset Impairment Charges	0.0	1.5	48.9
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0.4	0.8
Net gain (loss) on asset dispositions	138.3	130.3	77.9
Rail North America [Member]
Asset Impairment Charges		0.0	0.0
Net gain (loss) on asset dispositions	132.8	120.5	119.7
Rail International [Member]
Asset Impairment Charges	0.0	0.3	14.6
Charge for anticipated liquidation of translation adjustment			1.2
Net gain (loss) on asset dispositions	4.5	7.0	(11.2)
Portfolio Management [Member]
Asset Impairment Charges	0.0	1.2	34.3
Net gain (loss) on asset dispositions	$ 0.6	$ 2.2	$ (31.1)