Variable Interest Entities - Income Statement (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Variable Interest Entity [Line Items]
Lease Income	$ 518,700,000	$ 359,600,000
Other Operating Income	42,900,000	40,500,000
Total revenues	583,700,000	421,600,000
Maintenance expense	140,700,000	103,500,000
Depreciation expense	169,200,000	103,600,000
Operating lease expense	7,400,000	7,600,000
Other operating expense	21,800,000	16,000,000.0
Selling, general and administrative expense	71,300,000	56,600,000
Total expenses (1)	410,400,000	287,300,000
Net gain on asset dispositions	51,000,000.0	33,400,000
Interest (expense) income, net	(151,000,000.0)	(94,900,000)
Income taxes	(21,200,000)	(16,600,000)
Net Income	79,100,000	78,600,000
Payment for management fee	1,500,000	1,400,000
Cash paid for the acquisition of operating assets	4,520,000,000	296,300,000
Net proceeds from the issuance of debt	973,700,000	879,800,000
Cash paid for the repayment of debt	1,000,100,000	406,600,000
Loss before Income Taxes	79,500,000	70,100,000
GABX
Variable Interest Entity [Line Items]
Depreciation expense
Variable Interest Entity, Primary Beneficiary | GABX
Variable Interest Entity [Line Items]
Total revenues	134,900,000	0
Total expenses (1)	(100,200,000)	0
Net gain on asset dispositions	2,000,000.0	0
Interest (expense) income, net	(43,900,000)	0
Income taxes	(1,900,000)	0
Net Income	(9,100,000)	0
Payment for management fee	12,500,000
Cash paid for the acquisition of operating assets	4,230,800,000
Net proceeds from the issuance of debt	992,000,000.0
Cash paid for the repayment of debt	992,000,000.0
Loss before Income Taxes	$ (7,200,000)	$ 0