Note 1. Summary of Significant Accounting Policies Lessor Accounting (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term		5 years
Direct Financing Lease, Revenue		$ 0.0
Operating lease revenues		731.5	$ 679.4	$ 652.5
Variable operating lease revenues		68.7	60.3	54.2
Interest income on sales-type lease receivables		0.7	0.7	0.0
Profit recognized at sales-type lease commencement (1)	[1]	0.0	$ 1.3	$ 0.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Twelve Months		1.1
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Two Years		1.1
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Three Years		1.1
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Four Years		1.1
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Five Years		1.1
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Thereafter		9.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received		14.5
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount		(4.3)
Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
2024	[2]	682.3
2025	[2]	556.5
2026	[2]	435.3
2027	[2]	318.4
2028	[2]	184.9
Thereafter	[2]	320.0
Total	[2]	$ 2,497.4
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
Other Assets [Member]
Lessor, Lease, Description [Line Items]
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	[3]	$ (10.2)

[1] Included in gains on dispositions of property – lease portfolio sales on our Consolidated Statements of Operations.

[2] 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.

[3] Included in other assets in our Consolidated Balance Sheets.