Asset Impairments and Assets Held for Sale Asset Held For Sale (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 Vessel
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	$ 9,000,000	$ 8,600,000	$ 38,500,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure	1,300,000	4,500,000
Portfolio Management [Member]
Long Lived Assets Held-for-sale [Line Items]
Gain (Loss) on Disposition of Assets		1,800,000	5,200,000
Asset Impairment Charges	4,500,000	3,700,000	6,700,000
Rail North America [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	600,000	4,600,000	31,200,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure			43,900,000
Rail International [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	3,900,000	300,000	600,000
Nordic Vessels [Member]
Long Lived Assets Held-for-sale [Line Items]
Number Of Vessels | Vessel				6
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Long Lived Assets Held-for-sale [Line Items]
Railcars in Flammable Service			2,400
Adler Funding Llc [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	$ 0	$ 3,000,000	$ 0
Railcars [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets			90