Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Lease revenue	$ 1,251.4	$ 1,154.6	$ 1,140.5
Non-dedicated engine revenue	37.6	1.5	0.0
MarineOperatingRevenue	6.9	18.9	19.1
Other revenue	115.0	98.0	97.8
Total Revenues	1,410.9	1,273.0	1,257.4
Expenses
Maintenance Expense	344.8	292.7	297.1
Marine operating expense	6.5	14.1	17.5
Depreciation	376.3	357.5	364.4
Operating Lease, Expense	36.0	36.1	39.2
Other operating expense	46.6	37.4	44.0
Selling, general and administrative	212.7	195.0	198.3
Total Expenses	1,022.9	932.8	960.5
Other Income (Expense)
Net gain on asset dispositions	130.3	77.9	105.9
Interest expense, net	(263.4)	(214.0)	(204.0)
Other expense	(9.4)	(27.0)	(3.7)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	245.5	177.1	195.1
Income Taxes	(58.7)	(54.8)	(53.2)
Share of Affiliates’ Earnings (net of tax)	72.4	33.6	1.2
Net Income	259.2	155.9	143.1
Other Comprehensive Income, net of taxes
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	45.8	(56.7)	(51.7)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1.3	1.4	1.9
Post-retirement benefit plans	(3.1)	4.3	26.7
Other comprehensive income (loss)	44.0	(51.0)	(23.1)
Comprehensive Income	$ 303.2	$ 104.9	$ 120.0
Share Data
Earnings Per Share, Basic	$ 7.13	$ 4.41	$ 4.04
Average number of common shares (in shares)	35,700	35,400	35,400
Diluted earnings per share (in dollars per share)	$ 7.12	$ 4.35	$ 3.98
Average number of common shares and common share equivalents (in shares)	35,700	35,900	36,000