Note 6. Railcar Leasing and Management Services Group Selected Leasing Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Accounts Receivable, after Allowance for Credit Loss	$ 260.1	$ 276.6
Property, Plant and Equipment, Net	7,110.6	6,334.4
Restricted Cash and Cash Equivalents	111.4	171.6
Other Assets	396.2	253.5
Assets	8,701.4	7,989.2
Recourse And Non-Recourse Debt And Capital Lease Obligations	4,881.9	4,029.2
Deferred Tax Liabilities, Net	779.1	731.6
Other Liabilities	96.3	56.8
Liabilities	6,322.5	5,427.2
Stockholders' Equity Attributable to Noncontrolling Interest	348.8	351.2
Stockholders' Equity Attributable to Parent	2,030.1	2,210.8
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash, Cash Equivalents, and Short-term Investments	1.8	6.0
Accounts Receivable, after Allowance for Credit Loss	82.6	71.7
Property, Plant and Equipment, Net	7,605.6	6,791.2
Restricted Cash and Cash Equivalents	111.4	171.5
Other Assets	211.2	55.6
Assets	8,012.6	7,096.0
Accounts Payable and Accrued Liabilities	117.3	128.5
Recourse And Non-Recourse Debt And Capital Lease Obligations	4,359.1	3,631.8
Deferred Tax Liabilities, Net	862.8	798.6
Other Liabilities	60.7	12.9
Liabilities	5,399.9	4,571.8
Stockholders' Equity Attributable to Noncontrolling Interest	348.8	351.2
Stockholders' Equity Attributable to Parent	2,263.9	2,173.0
Intersegment Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	(903.8)	(827.7)
Wholly Owned Subsidiaries [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash, Cash Equivalents, and Short-term Investments	1.8	6.0
Accounts Receivable, after Allowance for Credit Loss	73.9	63.0
Property, Plant and Equipment, Net	5,818.9	4,976.5
Restricted Cash and Cash Equivalents	78.4	134.9
Other Assets	209.8	52.7
Assets	6,182.8	5,233.1
Accounts Payable and Accrued Liabilities	72.7	89.9
Recourse And Non-Recourse Debt And Capital Lease Obligations	3,080.7	2,316.6
Deferred Tax Liabilities, Net	861.7	797.6
Other Liabilities	60.7	12.9
Liabilities	4,075.8	3,217.0
Stockholders' Equity Attributable to Noncontrolling Interest	0.0	0.0
Stockholders' Equity Attributable to Parent	2,107.0	2,016.1
Partially-Owned Subsidiaries [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash, Cash Equivalents, and Short-term Investments	0.0	0.0
Accounts Receivable, after Allowance for Credit Loss	8.7	8.7
Property, Plant and Equipment, Net	1,786.7	1,814.7
Restricted Cash and Cash Equivalents	33.0	36.6
Other Assets	1.4	2.9
Assets	1,829.8	1,862.9
Accounts Payable and Accrued Liabilities	44.6	38.6
Recourse And Non-Recourse Debt And Capital Lease Obligations	1,278.4	1,315.2
Deferred Tax Liabilities, Net	1.1	1.0
Other Liabilities	0.0	0.0
Liabilities	1,324.1	1,354.8
Stockholders' Equity Attributable to Noncontrolling Interest	348.8	351.2
Stockholders' Equity Attributable to Parent	156.9	156.9
Consolidated Subsidiaries, Leasing [Member] | Intersegment Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash, Cash Equivalents, and Short-term Investments	0.0	0.0
Accounts Receivable, after Allowance for Credit Loss	0.0	0.0
Property, Plant and Equipment, Net	(903.8)	(827.7)
Restricted Cash and Cash Equivalents	0.0	0.0
Other Assets	0.0	0.0
Assets	(903.8)	(827.7)
Accounts Payable and Accrued Liabilities	0.0	0.0
Recourse And Non-Recourse Debt And Capital Lease Obligations	0.0	0.0
Deferred Tax Liabilities, Net	(184.8)	(163.2)
Other Liabilities	0.0	0.0
Liabilities	(184.8)	(163.2)
Stockholders' Equity Attributable to Noncontrolling Interest	0.0	0.0
Stockholders' Equity Attributable to Parent	(719.0)	(664.5)
Railcar Leasing and Management Services Group [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash, Cash Equivalents, and Short-term Investments	1.8	6.0
Accounts Receivable, after Allowance for Credit Loss	82.6	71.7
Property, Plant and Equipment, Net	6,701.8	5,963.5
Restricted Cash and Cash Equivalents	111.4	171.5
Other Assets	211.2	55.6
Assets	7,108.8	6,268.3
Accounts Payable and Accrued Liabilities	117.3	128.5
Recourse And Non-Recourse Debt And Capital Lease Obligations	4,359.1	3,631.8
Deferred Tax Liabilities, Net	678.0	635.4
Other Liabilities	60.7	12.9
Liabilities	5,215.1	4,408.6
Stockholders' Equity Attributable to Noncontrolling Interest	348.8	351.2
Stockholders' Equity Attributable to Parent	$ 1,544.9	$ 1,508.5