Investments in Affiliated Companies (Future Lease Receipts) (Details 7) $ in Millions	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
2021	$ 925.5
2022	702.7
2023	524.7
2019	357.7
2025	193.1
Years thereafter	215.0
Total future receipts from leases	2,918.7
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
2021	442.2
2022	416.0
2023	380.0
2019	360.0
2025	319.4
Years thereafter	815.0
Total future receipts from leases	2,732.6
RRPF Joint Ventures [Member] | Rolls-Royce [Member]
Schedule of Equity Method Investments [Line Items]
2021	228.9
2022	217.1
2023	193.9
2019	186.9
2025	165.1
Years thereafter	266.1
Total future receipts from leases	1,258.0
RRPF Joint Ventures [Member] | Third Parties [Member]
Schedule of Equity Method Investments [Line Items]
2021	213.3
2022	198.9
2023	186.1
2019	173.1
2025	154.3
Years thereafter	548.9
Total future receipts from leases	$ 1,474.6