Investments in Affiliated Companies (Summarized Financial Data-RRPF) (Details 6) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		$ 3,880.9	$ 3,670.7
Income Statement [Abstract]
Total Revenues		1,585.5	1,410.9	$ 1,273.0
Depreciation expense		(420.9)	(391.5)	(371.3)
Interest expense, net		(341.0)	(263.4)	(214.0)
Income Taxes		(60.0)	(58.7)	(54.8)
Net Income		284.2	259.2	155.9
Assets [Abstract]
Identifiable assets		12,296.5	11,326.0	10,072.0
EquityMethodInvestmentSummarizedFinancialInformationAPandAccruedExpense		217.1	239.6
Liabilities and Equity [Abstract]
Other liabilities		107.5	106.4
Total Liabilities and Shareholders’ Equity		12,296.5	11,326.0
Payment for Management Fee		4.1	2.7	1.0
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Income Statement [Abstract]
Total Revenues		514.0	487.2	417.7
Gains on sales of assets		75.2	91.7	22.9
Net Income		164.0	150.6	73.9
Assets [Abstract]
Current assets		610.5	495.9
Noncurrent assets		4,709.1	4,108.3
Identifiable assets		5,319.6	4,604.2
Liabilities and Equity [Abstract]
Current liabilities		618.4	351.5
Liabilities, Noncurrent		3,405.1	3,024.1
Total Liabilities and Shareholders’ Equity		5,319.6	4,604.2
RRPF Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		1,618.4	1,646.3
Income Statement [Abstract]
Depreciation expense		(206.2)	(223.7)	(230.6)
Interest expense, net		(127.3)	(135.9)	(110.1)
Other expenses		(37.7)	(19.3)	(7.0)
Gains on sales of assets		75.5	92.6	22.9
Income (Loss) Attributable to Parent, before Tax		216.6	197.5	90.8
Income Taxes		(49.4)	(42.5)	(17.5)
Net Income		167.2	155.0	73.3
Assets [Abstract]
Current assets		607.9	493.2
Noncurrent assets	[1]	4,709.1	4,108.3
Identifiable assets		5,317.0	4,601.5
EquityMethodInvestmentSummarizedFinancialInformationAPandAccruedExpense		239.6	170.0
Liabilities and Equity [Abstract]
Current liabilities		378.2	181.5
Liabilities, Noncurrent		2,673.7	2,451.1
Other liabilities		731.3	571.9
Shareholders’ equity		1,294.2	1,227.0
Total Liabilities and Shareholders’ Equity		5,317.0	4,601.5
Collateral of long-term debt		3,954.7
Third Parties [Member] | RRPF Joint Ventures [Member]
Income Statement [Abstract]
Total Revenues		268.1	224.8	192.8
Rolls Royce [Member] | RRPF Joint Ventures [Member]
Income Statement [Abstract]
Total Revenues		225.3	253.0	222.8
Other revenue		$ 18.9	$ 6.0	$ 0.0

[1] (1) $3,954.7 million of operating assets were pledged as collateral for long-term debt obligations at December 31, 2024.