Railcar Leasing and Management Services Group - Future operating lease obligations and future contractual minimum rental revenues (Details) $ in Millions	Sep. 30, 2022 USD ($)
Future operating lease obligations
Remaining three months of 2022	$ 5.3
2023	19.9
2024	14.9
2025	12.1
2026	11.4
Thereafter	66.5
Lessee, Operating Lease, Liability, to be Paid, Total	130.1
Railcar Leasing and Management Services Group [Member]
Future operating lease obligations
Remaining three months of 2022	3.2
2023	12.0
2024	8.0
2025	6.0
2026	5.7
Thereafter	8.7
Lessee, Operating Lease, Liability, to be Paid, Total	43.6
Future contractual minimum rental revenues
Remaining three months of 2022	156.7	[1]
2023	519.9	[1]
2024	406.0	[1]
2025	307.4	[1]
2026	220.0	[1]
Thereafter	369.4	[1]
Total	1,979.4	[1]
Railcar Leasing and Management Services Group [Member] | Railroad Transportation Equipment
Future operating lease obligations
Remaining three months of 2022	3.2
2023	11.9
2024	7.9
2025	6.0
2026	5.7
Thereafter	8.7
Lessee, Operating Lease, Liability, to be Paid, Total	43.4
Railcar Leasing and Management Services Group [Member] | Building [Member]
Future operating lease obligations
Lessee, Operating Lease, Liability, to be Paid, Total	0.2
Railcar Leasing and Management Services Group [Member] | Property Lease Guarantee [Member]
Future contractual minimum rental revenues
Guarantor Obligations, Maximum Exposure, Undiscounted	1.4
Railcar Leasing and Management Services Group [Member] | Operating leases
Future contractual minimum rental revenues
Remaining three months of 2022	2.5
2023	7.7
2024	3.8
2025	2.6
2026	1.9
Thereafter	0.5
Total	$ 19.0

[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.