Note 8. Debt Debt Discount and Issuance Costs (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Senior Notes [Member] | Corporate Segment [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 0.2	$ 0.3
Wholly Owned Subsidiaries [Member] | 2018 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.2	0.2
Wholly Owned Subsidiaries [Member] | TRIHC 2018 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	1.4	2.5
Wholly Owned Subsidiaries [Member] | 2019 Secured Railcar Equipment Notes [Domain] [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	$ 0.4	$ 0.0