Note 8. Debt Remaining Debt Principal Payments (Details) $ in Millions	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 231.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	520.7
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	628.7
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	1,298.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	441.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	2,094.6
Long-term Debt, Gross	5,215.3
Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	400.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal 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]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	15.1
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	11.7
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	14.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	19.8
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	18.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	48.9
Long-term Debt, Gross	128.5
Secured Debt [Member] | 2010 Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	28.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	22.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	18.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	20.6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	25.7
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	105.1
Long-term Debt, Gross	220.6
Secured Debt [Member] | 2018 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	19.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	19.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	19.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	14.8
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	14.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	330.3
Long-term Debt, Gross	416.6
Secured Debt [Member] | 2019 Secured Railcar Equipment Notes [Domain] [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	36.8
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	34.9
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	36.6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	35.2
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	313.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	366.3
Long-term Debt, Gross	823.1
Secured Debt [Member] | 2020 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	18.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	18.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	14.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	11.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	14.1
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	272.4
Long-term Debt, Gross	348.9
Secured Debt [Member] | 2021 Secured Railcar Equipment Notes [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	12.6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	12.2
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	13.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	12.6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	14.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	255.6
Long-term Debt, Gross	320.3
Secured Debt [Member] | TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	5.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	10.9
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	15.6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	15.8
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	17.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	287.4
Long-term Debt, Gross	352.3
Secured Debt [Member] | TRIP Master Funding Secured Railcar Equipment Notes [Member] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	19.2
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	16.5
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	33.2
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	30.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	24.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	428.6
Long-term Debt, Gross	551.5
Promissory Notes [Member] | 2017 Secured Railcar Equipment Notes [Member] [Domain] | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	44.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	44.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	44.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	634.8
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	0.0
Long-term Debt, Gross	768.0
Line of Credit [Member] | TILC Warehouse Facility [Member] | Railcar Leasing and Management Services Group [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	19.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	19.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	19.4
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	3.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	0.0
Long-term Debt, Gross	61.5
Line of Credit [Member] | TILC Warehouse Facility Termination Payments [Member] | Railcar Leasing and Management Services Group [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	500.3
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	0.0
Long-term Debt, Gross	500.3
Line of Credit [Member] | TRIP Railcar Co Term Loan | Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	12.6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	311.1
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	0.0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five	0.0
Long-term Debt, Gross	$ 323.7