Note 11. Restructuring Activities (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net	$ 0.0	$ 0.0	$ 1.0	$ 0.0	$ (2.6)	$ (0.1)	$ (0.7)	$ (0.3)	$ 1.0	$ (3.7)	$ 10.9
Severance Costs										0.3	7.7
Loss on Contract Termination											0.6
Gain (Loss) on Disposition of Assets										(4.0)	(2.7)
Non-cash impact of restructuring activities											5.3
Railcar Leasing and Management Services Group [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net										0.0	1.4
Severance Costs										0.0	1.4
Loss on Contract Termination											0.0
Gain (Loss) on Disposition of Assets										0.0	0.0
Non-cash impact of restructuring activities											0.0
Rail Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net										0.3	1.3
Severance Costs										0.3	4.0
Loss on Contract Termination											0.2
Gain (Loss) on Disposition of Assets										0.0	(2.9)
Non-cash impact of restructuring activities											0.0
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities, net										(4.0)	8.2
Severance Costs										0.0	2.3
Loss on Contract Termination											0.4
Gain (Loss) on Disposition of Assets										$ (4.0)	0.2
Non-cash impact of restructuring activities											$ 5.3