Railcar Leasing and Services Group - Other Operating Lease Obligations & Future Revenues (Details) $ in Millions	Jun. 30, 2024 USD ($)
Future operating lease obligations
Remaining six months of 2024	$ 10.5
2025	19.3
2026	17.6
2027	16.3
2028	12.8
Thereafter	58.2
Lessee, Operating Lease, Liability, to be Paid, Total	134.7
Railcars on Lease [Member]
Future operating lease obligations
Remaining six months of 2024	4.4
2025	8.3
2026	7.7
2027	7.2
2028	5.1
Thereafter	6.8
Lessee, Operating Lease, Liability, to be Paid, Total	39.5
Leasing & Services
Future contractual minimum rental revenues
Remaining six months of 2024	362.9	[1]
2025	623.5	[1]
2026	503.0	[1]
2027	377.9	[1]
2028	236.1	[1]
Thereafter	345.9	[1]
Total	2,449.3	[1]
Leasing & Services | Property Lease Guarantee [Member]
Future contractual minimum rental revenues
Guarantor Obligations, Maximum Exposure, Undiscounted	0.7
Leasing & Services | Other Third Parties [Member]
Future contractual minimum rental revenues
Remaining six months of 2024	5.8
2025	9.7
2026	7.2
2027	2.3
2028	0.7
Thereafter	1.7
Total	$ 27.4

[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.