Investments in Affiliated Companies (Summarized Financial Data-RRPF) (Details 6) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		$ 3,670,700,000	$ 3,424,700,000
Income Statement [Abstract]
Total Revenues		1,410,900,000	1,273,000,000	$ 1,257,400,000
Depreciation expense		(391,500,000)	(371,300,000)	(378,400,000)
Interest expense, net		(263,400,000)	(214,000,000.0)	(204,000,000.0)
Income Taxes		(58,700,000)	(54,800,000)	(53,200,000)
Net Income		259,200,000	155,900,000	143,100,000
Assets [Abstract]
Identifiable assets		11,326,000,000	10,072,000,000	9,541,700,000
EquityMethodInvestmentSummarizedFinancialInformationAPandAccruedExpense		239,600,000	202,200,000
Liabilities and Equity [Abstract]
Other liabilities		106,400,000	102,000,000.0
Total Liabilities and Shareholders’ Equity		11,326,000,000	10,072,000,000
Payment for Management Fee		2,700,000	1.0	0.9
Collateral of long-term debt		3,574,700,000
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Income Statement [Abstract]
Total Revenues		487,200,000	417,700,000	407,400,000
Gains on sales of assets		91,700,000	22,900,000	79,500,000
Net Income		150,600,000	73,900,000	5,000,000.0
Assets [Abstract]
Current assets		495,900,000	490,700,000
Noncurrent assets		4,108,300,000	4,186,100,000
Identifiable assets		4,604,200,000	4,676,800,000
Liabilities and Equity [Abstract]
Current liabilities		351,500,000	631,800,000
Liabilities, Noncurrent		3,024,100,000	2,916,300,000
Total Liabilities and Shareholders’ Equity		4,604,200,000	4,676,800,000
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		1,646,300,000	1,637,500,000
Income Statement [Abstract]
Depreciation expense		(223,700,000)	(230,600,000)	(238,300,000)
Interest expense, net		(135,900,000)	(110,100,000)	(96,700,000)
Other expenses		(19,300,000)	(7,000,000.0)	(38,500,000)
Gains on sales of assets		92,600,000	22,900,000	79,500,000
Income (Loss) Attributable to Parent, before Tax		197,500,000	90,800,000	113,400,000
Income Taxes		(42,500,000)	(17,500,000)	(107,400,000)
Net Income		155,000,000.0	73,300,000	6,000,000.0
Assets [Abstract]
Current assets		493,200,000	485,400,000
Noncurrent assets	[1]	4,108,300,000	4,186,100,000
Identifiable assets		4,601,500,000	4,671,500,000
EquityMethodInvestmentSummarizedFinancialInformationAPandAccruedExpense		170,000,000.0	128,700,000
Liabilities and Equity [Abstract]
Current liabilities		181,500,000	503,100,000
Liabilities, Noncurrent		2,451,100,000	2,442,700,000
Other liabilities		571,900,000	473,600,000
Shareholders’ equity		1,227,000,000	1,123,400,000
Total Liabilities and Shareholders’ Equity		4,601,500,000	4,671,500,000
Third Parties [Member] | RRPF Joint Ventures [Member]
Income Statement [Abstract]
Total Revenues		224,800,000	192,800,000	195,500,000
Rolls Royce [Member] | RRPF Joint Ventures [Member]
Income Statement [Abstract]
Total Revenues		253,000,000.0	222,800,000	211,900,000
Other revenue		$ 6,000,000.0	$ 0	$ 0

[1] (a) $3,574.7 million of operating assets were pledged as collateral for long-term debt obligations at December 31, 2023.