Investments in Affiliated Companies (Future Lease Receipts) (Details 7) $ in Millions	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
2016	$ 947.7
2017	755.8
2018	589.9
2019	424.8
2020	302.8
Years thereafter	524.8
Total future receipts from leases	3,545.8	[1]
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
2016	363.4
2017	332.5
2018	299.1
2019	252.0
2020	228.3
Years thereafter	679.9
Total future receipts from leases	2,155.2
RRPF Joint Ventures [Member] | Rolls-Royce [Member]
Schedule of Equity Method Investments [Line Items]
2016	210.2
2017	203.4
2018	185.2
2019	158.9
2020	148.6
Years thereafter	465.9
Total future receipts from leases	1,372.2
RRPF Joint Ventures [Member] | Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
2016	153.2
2017	129.1
2018	113.9
2019	93.1
2020	79.7
Years thereafter	214.0
Total future receipts from leases	$ 783.0

[1] (1) The future contractual receipts due under our full-service operating leases include executory costs such as maintenance, car taxes, and insurance.