Note 1. Summary of Significant Accounting Policies Goodwill and Intangibles (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0
Intangible Assets, Net (Excluding Goodwill)	16,000,000.0	18,700,000
Finite-Lived Intangible Assets, Net	13,500,000	16,200,000
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Goodwill	$ 208,800,000	208,800,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Railcar Leasing and Management Services Group [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,800,000	1,800,000
Rail Products Group [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	145,400,000	145,400,000
Other Segments [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 61,600,000	$ 61,600,000