Investments in Affiliated Companies (Share of Affiliate Earnings) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	$ 157.0	$ 108.3	$ 98.1
Provision for Income Taxes, Equity Method Investment	(39.7)	(25.5)	(25.7)
Share of Affiliates' Earnings	117.3	82.8	72.4
Rail North America [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	(0.2)	0.0	(0.6)
Rail International [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	0.0	0.0	0.0
Portfolio Management [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	$ 157.2	$ 108.3	$ 98.7