Railcar Leasing and Management Services Group - Future operating lease obligations and future contractual minimum rental revenues (Details) $ in Millions	Jun. 30, 2021 USD ($)
Future contractual minimum rental revenues
Total operating lease payments	$ 136.3
Railcar Leasing and Management Services Group [Member]
Future operating lease obligations
Remaining six months of 2021	5.4
2022	10.1
2023	8.3
2024	4.9
2025	3.2
Thereafter	6.2
Total	38.1
Future contractual minimum rental revenues
Total operating lease payments	39.9
Railcar Leasing and Management Services Group [Member] \| Building [Member]
Future contractual minimum rental revenues
Total operating lease payments	1.8
Railcar Leasing and Management Services Group [Member] \| Property Lease Guarantee [Member]
Future contractual minimum rental revenues
Guarantor Obligations, Maximum Exposure, Undiscounted	1.9
Railcar Leasing and Management Services Group [Member] \| Operating leases
Future contractual minimum rental revenues
Remaining six months of 2021	2.6
2022	3.8
2023	1.9
2024	1.1
2025	0.3
Thereafter	0.1
Total	$ 9.8

Amount of minimum sublease rentals to be received by the seller-lessee for sale-leaseback transactions accounted for using the deposit method or as a financing.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121602099&loc=d3e50824-112756