Note 1. Summary of Significant Accounting Policies Lessor Accounting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Operating Lease, Lease Income, Lease Payments	$ 676.3
Operating Lease, Variable Lease Income	50.5
Sales-type Lease, Interest Income	2.4
Sales-type Lease, Selling Profit (Loss)	$ 19.0
Lessor, Operating Lease, Renewal Term	5 years
Lessor, Operating Lease, Termination Option Term	1 year
Direct Financing Lease, Revenue	$ 0.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Twelve Months	43.4
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Two Years	131.8
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Three Years	0.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Four Years	0.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Five Years	0.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Thereafter	0.0
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	175.2
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	(20.7)
Sales-type Lease, Net Investment in Lease	154.5
Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	568.1
Operating Leases, Future Minimum Payments Receivable, in Two Years	451.9
Operating Leases, Future Minimum Payments Receivable, in Three Years	347.1
Operating Leases, Future Minimum Payments Receivable, in Four Years	243.7
Operating Leases, Future Minimum Payments Receivable, in Five Years	154.0
Operating Leases, Future Minimum Payments Receivable, Thereafter	268.3
Operating Leases, Future Minimum Payments Receivable	$ 2,033.1
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	20 years
Other Assets [Member]
Lessor, Lease, Description [Line Items]
Sales-type Lease, Lease Income	$ 160.5