Investments in Affiliated Companies (Future Lease Receipts) (Details 7) $ in Millions	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
2016	$ 938.4
2017	726.4
2018	532.9
2019	399.3
2020	261.5
Years thereafter	289.9
Total future receipts from leases	3,148.4
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
2016	472.9
2017	436.8
2018	410.8
2019	374.2
2020	351.7
Years thereafter	940.9
Total future receipts from leases	2,987.3
RRPF Joint Ventures [Member] | Rolls-Royce [Member]
Schedule of Equity Method Investments [Line Items]
2016	262.2
2017	250.5
2018	239.7
2019	216.5
2020	208.6
Years thereafter	472.0
Total future receipts from leases	1,649.5
RRPF Joint Ventures [Member] | Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
2016	210.7
2017	186.3
2018	171.1
2019	157.7
2020	143.1
Years thereafter	468.9
Total future receipts from leases	$ 1,337.8