Note 1. Summary of Significant Accounting Policies Lessor Accounting (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term		5 years
Lessor, Operating Lease, Termination Option Term		one year
Sales-type Lease, Revenue		$ 0.0	$ 160.5
Interest income on sales-type lease receivables		0.0	2.4
Direct Financing Lease, Revenue		0.0	0.0
Operating lease revenues		671.4	676.3
Variable operating lease revenues		51.0	50.5
Profit recognized at sales-type lease commencement		0.0	$ 19.0
Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
2021	[1]	555.4
2021	[1]	436.2
2023	[1]	323.9
2024	[1]	238.6
2025	[1]	161.1
Thereafter	[1]	290.6
Total	[1]	$ 2,005.8
Railcar Leasing and Management Services Group [Member] | Minimum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract		1 year
Railcar Leasing and Management Services Group [Member] | Maximum [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract		10 years

[1] Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.