Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Remaining Performance Obligation

Unsatisfied Performance Obligations

The following table includes estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially satisfied as of September 30, 2021 and the percentage of the outstanding performance obligations as of September 30, 2021 expected to be delivered during the remainder of 2021:

	Unsatisfied performance obligations at September 30, 2021
	Total Amount		Percent expected to be delivered in 2021
	(in millions)
Rail Products Group:
New railcars:
External customers	$	980.9
Leasing Group	247.5
	$	1,228.4	31.8	%
Sustainable railcar conversions (1)	$	98.3	25.8	%
Maintenance services	$	3.1	100.0	%
Railcar Leasing and Management Services Group	$	81.2	8.1	%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Future contractual minimum operating lease liabilities will mature as follows (in millions):

	Leasing Group		Non-Leasing Group		Total
Remaining three months of 2021	$	2.9	$	1.1	$	4.0
2022	11.1		8.2		19.3
2023	9.3		8.2		17.5
2024	5.9		7.0		12.9
2025	4.0		6.3		10.3
Thereafter	8.1		64.8		72.9
Total operating lease payments	$	41.3	$	95.6	$	136.9
Less: Present value adjustment					(20.7)
Total operating lease liabilities					$	116.2

Lessor, Payments to be Received, Maturity [Table Text Block]

Future contractual minimum revenues for operating leases will mature as follows (in millions)(1):

Remaining three months of 2021	$	146.7
2022	497.6
2023	374.8
2024	280.2
2025	198.0
Thereafter	344.4
Total	$	1,841.7

(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.

Schedule of Product Warranty Liability [Table Text Block]

The changes in the accruals for warranties for the three and nine months ended September 30, 2021 and 2020 are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(in millions)
Beginning balance	$	5.8	$	9.5	$	11.7	$	8.1
Warranty costs incurred	(3.4)		(0.3)		(6.4)		(1.8)
Warranty originations and revisions	1.7		0.3		(0.7)		3.3
Warranty expirations	(0.2)		(0.3)		(0.7)		(0.4)
Ending balance	$	3.9	$	9.2	$	3.9	$	9.2