Investments in Affiliated Companies (Share of Affiliate Earnings) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	$ 61.1	$ 55.9	$ 53.1
Provision for Income Taxes, Equity Method Investment	(10.8)	(12.0)	(5.7)
Share of Affiliates' Earnings	50.3	43.9	47.4
Rail North America [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	0.6	(2.4)	0.5
Rail International [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	0.0	(0.1)	(0.2)
Portfolio Management [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	$ 60.5	$ 58.4	$ 52.8