Note 11. Restructuring Activities (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 3.4				$ 3.4	$ 0.0
Severance Costs					3.8
Payments for Restructuring					(0.4)
Asset Impairment Charges					10.9	0.0	$ 0.0
Restructuring Charges	$ 14.7	$ 0.0	$ 0.0	$ 0.0	14.7	$ 0.0	$ 0.0
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					0.2
Asset Impairment Charges					0.0
Restructuring Charges					0.2
Operating Segments [Member] | Rail Group [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					0.7
Asset Impairment Charges					0.0
Restructuring Charges					0.7
Operating Segments [Member] | Other Segments [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					0.5
Asset Impairment Charges					10.9
Restructuring Charges					11.4
Operating Segments [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					2.4
Asset Impairment Charges					0.0
Restructuring Charges					$ 2.4