Investments in Affiliated Companies (Investments and Distributions) (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Asset Impairment Charges	$ 1.5	$ 48.9	$ 2.4
Payments to Acquire Equity Method Investments	0.0	0.0	0.4
Proceeds from Equity Method Investment, Distribution	25.0	46.3	0.1
Rail North America [Member]
Schedule of Equity Method Investments [Line Items]
Asset Impairment Charges	0.0	0.0	2.4
Payments to Acquire Equity Method Investments	0.0	0.0	0.4
Proceeds from Equity Method Investment, Distribution	0.0	0.0	0.0
Rail International [Member]
Schedule of Equity Method Investments [Line Items]
Asset Impairment Charges	0.3	14.6	0.0
Portfolio Management [Member]
Schedule of Equity Method Investments [Line Items]
Asset Impairment Charges	1.2	34.3	0.0
Payments to Acquire Equity Method Investments	0.0	0.0	0.0
Proceeds from Equity Method Investment, Distribution	$ 25.0	$ 46.3	$ 0.1