Note 11. Restructuring Activities (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.1				$ 1.4				$ 0.1	$ 1.4
Severance Costs									0.3	7.7	$ 3.8
Payments for Restructuring									(1.6)
Restructuring activities, net	(2.6)	$ (0.1)	$ (0.7)	$ (0.3)	0.5	$ 4.7	$ 0.3	$ 5.4	(3.7)	10.9	14.6
Loss on Contract Termination										0.6
Gain (Loss) on Disposition of Assets									(4.0)	(2.7)
Restructuring and Related Cost, Incurred Cost									0.3
Non-cash impact of restructuring activities										5.3	10.8
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.1				$ 1.4				0.1	1.4
Payments for Restructuring									(1.6)
Railcar Leasing and Management Services Group [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs									0.0	1.4	0.2
Restructuring activities, net									0.0	1.4	0.2
Loss on Contract Termination										0.0
Gain (Loss) on Disposition of Assets									0.0	0.0
Non-cash impact of restructuring activities										0.0	0.0
Rail Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs									0.3	4.0	0.7
Restructuring activities, net									0.3	1.3	0.7
Loss on Contract Termination										0.2
Gain (Loss) on Disposition of Assets									0.0	(2.9)
Non-cash impact of restructuring activities										0.0	0.0
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs									0.0	2.3	2.9
Restructuring activities, net									(4.0)	8.2	13.7
Loss on Contract Termination										0.4
Gain (Loss) on Disposition of Assets									$ (4.0)	0.2
Non-cash impact of restructuring activities										$ 5.3	$ 10.8