Asset Impairments and Assets Held for Sale Asset Held For Sale (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	$ 38,500,000	$ 33,900,000	$ 1,300,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure	89,500,000	106,000,000
Portfolio Management [Member]
Long Lived Assets Held-for-sale [Line Items]
Gain (Loss) on Disposition of Assets	5,200,000	21,600,000
Asset Impairment Charges	6,700,000	31,000,000	(100,000)
Assets Held-for-sale, Long Lived, Fair Value Disclosure	45,600,000	103,400,000
Rail North America [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	31,200,000	2,500,000	700,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure	43,900,000	2,600,000
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
Cardinal Marine [Member]
Long Lived Assets Held-for-sale [Line Items]
Asset Impairment Charges	$ 0	$ 19,000,000	$ 0
Railcars [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets	90