Investments in Affiliated Companies (Share of Affiliate Earnings) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	$ 45.4	$ 67.8	$ 92.3
Provision for Income Taxes, Equity Method Investment	0.5	(18.3)	(16.5)
Share of Affiliates' Earnings	45.9	49.5	75.8
Rail North America [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	0.5	7.9	10.3
Rail International [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	(0.3)	(0.3)	21.1
Portfolio Management [Member]
Pre tax share of affiliates earnings by segment
Share of affiliates' earnings (pre-tax)	$ 45.2	$ 60.2	$ 60.9