Investments in Affiliated Companies (Summarized Financial Data-RRPF) (Details 6) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		$ 3,424.7	$ 3,378.8
Income Statement [Abstract]
Total Revenues		1,273.0	1,257.4	$ 1,209.2
Depreciation expense		(371.3)	(378.4)	(342.8)
Interest expense, net		(214.0)	(204.0)	(190.3)
Income Taxes		(54.8)	(53.2)	(37.3)
Net Income		155.9	143.1	151.3
Assets [Abstract]
Identifiable assets		10,072.0	9,541.7	8,937.6
EquityMethodInvestmentSummarizedFinancialInformationAPandAccruedExpense		202.2	215.8
Liabilities and Equity [Abstract]
Other liabilities		102.0	112.4
Total Liabilities and Shareholders’ Equity		10,072.0	9,541.7
Foreign Tax Authority | United Kingdom tax authority
Liabilities and Equity [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		39.7	12.3
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Income Statement [Abstract]
Total Revenues		417.7	407.4	491.0
Gains on sales of assets		22.9	79.5	115.7
Net Income		73.9	5.0	146.1
Assets [Abstract]
Current assets		490.7	574.3
Noncurrent assets		4,186.1	4,389.4
Identifiable assets		4,676.8	4,963.7
Liabilities and Equity [Abstract]
Current liabilities		631.8	492.6
Liabilities, Noncurrent		2,916.3	3,329.6
Total Liabilities and Shareholders’ Equity		4,676.8	4,963.7
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		1,637.5	1,415.5
Income Statement [Abstract]
Depreciation expense		(230.6)	(238.3)	(248.7)
Interest expense, net		(110.1)	(96.7)	(116.0)
Other expenses		(7.0)	(38.5)	(50.3)
Gains on sales of assets		22.9	79.5	115.7
Income (Loss) Attributable to Parent, before Tax		90.8	113.4	191.7
Income Taxes		(17.5)	(107.4)	(45.6)
Net Income		73.3	6.0	146.1
Assets [Abstract]
Current assets		485.4	573.5
Noncurrent assets	[1]	4,186.1	4,389.4
Identifiable assets		4,671.5	4,962.9
EquityMethodInvestmentSummarizedFinancialInformationAPandAccruedExpense		128.7	130.9
Liabilities and Equity [Abstract]
Current liabilities		503.1	361.8
Liabilities, Noncurrent		2,442.7	2,845.1
Other liabilities		473.6	484.4
Shareholders’ equity		1,123.4	1,140.7
Total Liabilities and Shareholders’ Equity		4,671.5	4,962.9
Third Parties [Member] | RRPF Joint Ventures [Member]
Income Statement [Abstract]
Total Revenues		192.8	195.5	257.6
Rolls Royce [Member] | RRPF Joint Ventures [Member]
Income Statement [Abstract]
Total Revenues		$ 222.8	$ 211.9	$ 233.4

[1] (a) All operating assets were pledged as collateral for long-term debt obligations.