Railcar Leasing and Management Services Group - Future contractual minimum rental revenues on leases (Details) - Railcar Leasing and Management Services Group $ in Millions	Sep. 30, 2019 USD ($)
Future contractual minimum rental revenue
Operating Leases, Future Minimum Payments Receivable, Remainder of Fiscal Year	$ 149.4
Operating Leases, Future Minimum Payments Receivable, in Two Years	521.3
Operating Leases, Future Minimum Payments Receivable, in Three Years	413.0
Operating Leases, Future Minimum Payments Receivable, in Four Years	314.8
Operating Leases, Future Minimum Payments Receivable, in Five Years	217.1
Thereafter	388.2
Total	2,003.8
Railroad Transportation Equipment
Future contractual minimum rental revenue
Operating Leases, Future Minimum Payments Receivable, Remainder of Fiscal Year	146.8
Operating Leases, Future Minimum Payments Receivable, in Two Years	513.4
Operating Leases, Future Minimum Payments Receivable, in Three Years	406.9
Operating Leases, Future Minimum Payments Receivable, in Four Years	310.3
Operating Leases, Future Minimum Payments Receivable, in Five Years	214.9
Thereafter	387.4
Total	$ 1,979.7