Note 9. Debt Remaining Debt Principal Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	$ 673.2
Long-Term Debt, Maturity, Year Two	1,338.1
Long-Term Debt, Maturity, Year Three	1,107.7
Long-Term Debt, Maturity, Year Four	1,075.5
Long-Term Debt, Maturity, Year Five	1,298.1
Long-Term Debt, Maturity, after Year Five	295.5
Long-term Debt, Gross	5,788.1
Other Equipment Financing | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	2.3
Long-Term Debt, Maturity, Year Two	2.4
Long-Term Debt, Maturity, Year Three	2.5
Long-Term Debt, Maturity, Year Four	2.7
Long-Term Debt, Maturity, Year Five	2.9
Long-Term Debt, Maturity, after Year Five	39.5
Long-term Debt, Gross	52.3
4.55% Senior Notes Due October 2024 [Member] | Corporate Segment [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	400.0
Long-Term Debt, Maturity, Year Two	0.0
Long-Term Debt, Maturity, Year Three	0.0
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	400.0
7.55% Senior Notes due 2028 | Corporate Segment [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	0.0
Long-Term Debt, Maturity, Year Two	0.0
Long-Term Debt, Maturity, Year Three	0.0
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	400.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	400.0
Secured Debt [Member] | 2009 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	14.2
Long-Term Debt, Maturity, Year Two	19.4
Long-Term Debt, Maturity, Year Three	18.2
Long-Term Debt, Maturity, Year Four	17.2
Long-Term Debt, Maturity, Year Five	19.4
Long-Term Debt, Maturity, after Year Five	11.3
Long-term Debt, Gross	99.7
Secured Debt [Member] | 2010 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	30.8
Long-Term Debt, Maturity, Year Two	20.4
Long-Term Debt, Maturity, Year Three	25.5
Long-Term Debt, Maturity, Year Four	28.3
Long-Term Debt, Maturity, Year Five	24.0
Long-Term Debt, Maturity, after Year Five	52.2
Long-term Debt, Gross	181.2
Secured Debt [Member] | 2018 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	18.9
Long-Term Debt, Maturity, Year Two	14.8
Long-Term Debt, Maturity, Year Three	14.4
Long-Term Debt, Maturity, Year Four	18.1
Long-Term Debt, Maturity, Year Five	311.9
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	378.1
Secured Debt [Member] | 2019 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	36.5
Long-Term Debt, Maturity, Year Two	35.0
Long-Term Debt, Maturity, Year Three	677.1
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	748.6
Secured Debt [Member] | 2020 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	14.1
Long-Term Debt, Maturity, Year Two	11.1
Long-Term Debt, Maturity, Year Three	13.9
Long-Term Debt, Maturity, Year Four	272.2
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	311.3
Secured Debt [Member] | 2021 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	13.3
Long-Term Debt, Maturity, Year Two	12.6
Long-Term Debt, Maturity, Year Three	14.0
Long-Term Debt, Maturity, Year Four	14.0
Long-Term Debt, Maturity, Year Five	241.4
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	295.3
Secured Debt [Member] | 2022 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	9.0
Long-Term Debt, Maturity, Year Two	6.7
Long-Term Debt, Maturity, Year Three	8.1
Long-Term Debt, Maturity, Year Four	8.2
Long-Term Debt, Maturity, Year Five	8.2
Long-Term Debt, Maturity, after Year Five	192.5
Long-term Debt, Gross	232.7
Secured Debt [Member] | TRP 2021 Secured Railcar Equipment Notes - RIV 2013 [Member] | Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	15.5
Long-Term Debt, Maturity, Year Two	15.8
Long-Term Debt, Maturity, Year Three	17.2
Long-Term Debt, Maturity, Year Four	286.6
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	335.1
Secured Debt [Member] | Triumph Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	32.3
Long-Term Debt, Maturity, Year Two	29.1
Long-Term Debt, Maturity, Year Three	23.3
Long-Term Debt, Maturity, Year Four	417.1
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	501.8
Secured Debt [Member] | Tribute Secured Railcar Equipment Notes | Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	13.7
Long-Term Debt, Maturity, Year Two	14.9
Long-Term Debt, Maturity, Year Three	282.4
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	311.0
Promissory Notes [Member] | 2017 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	44.4
Long-Term Debt, Maturity, Year Two	632.8
Long-Term Debt, Maturity, Year Three	0.0
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	677.2
Line of Credit [Member] | TRL-2023 Term Loan | Railcar Leasing and Management Services Group [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	11.0
Long-Term Debt, Maturity, Year Two	11.0
Long-Term Debt, Maturity, Year Three	11.1
Long-Term Debt, Maturity, Year Four	11.1
Long-Term Debt, Maturity, Year Five	290.3
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	334.5
Line of Credit [Member] | TILC Warehouse Facility [Member] | Railcar Leasing and Management Services Group [Member] | Revolving Credit Facility [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	17.2
Long-Term Debt, Maturity, Year Two	22.9
Long-Term Debt, Maturity, Year Three	0.0
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	40.1
Line of Credit [Member] | TILC Warehouse Facility Termination Payments [Member] | Railcar Leasing and Management Services Group [Member] | Revolving Credit Facility [Member] | Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	0.0
Long-Term Debt, Maturity, Year Two	489.2
Long-Term Debt, Maturity, Year Three	0.0
Long-Term Debt, Maturity, Year Four	0.0
Long-Term Debt, Maturity, Year Five	0.0
Long-Term Debt, Maturity, after Year Five	0.0
Long-term Debt, Gross	$ 489.2