Railcar Leasing and Services Group - Other Operating Lease Obligations & Future Revenues (Details) $ in Millions	Sep. 30, 2024 USD ($)
Future operating lease obligations
Remaining three months of 2024	$ 5.4
2025	20.1
2026	18.1
2027	16.8
2028	12.9
Thereafter	58.1
Lessee, Operating Lease, Liability, to be Paid, Total	131.4
Railcars on Lease [Member]
Future operating lease obligations
Remaining three months of 2024	2.3
2025	8.7
2026	8.0
2027	7.5
2028	5.0
Thereafter	6.8
Lessee, Operating Lease, Liability, to be Paid, Total	38.3
Leasing & Services
Future contractual minimum rental revenues
Remaining three months of 2024	186.1	[1]
2025	660.8	[1]
2026	535.2	[1]
2027	406.1	[1]
2028	258.0	[1]
Thereafter	402.3	[1]
Total	2,448.5	[1]
Leasing & Services | Property Lease Guarantee [Member]
Future contractual minimum rental revenues
Guarantor Obligations, Maximum Exposure, Undiscounted	0.6
Leasing & Services | Other Third Parties [Member]
Future contractual minimum rental revenues
Remaining three months of 2024	3.2
2025	11.5
2026	8.6
2027	3.2
2028	1.0
Thereafter	1.8
Total	$ 29.3

[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.